How to debug MCUboot swap failure after OTA DFU? boot_request_upgrade() has no effect

[QBSho]

Hi everyone,

I'm facing an issue where MCUboot doesn't perform a swap after reboot, even though the DFU download to slot 1 completes successfully and boot_request_upgrade() is called.

My devices are in production and had no issues in the paste with BLE DFU update. As we update to 2.9.0 the problems starts. Some devices are not working after BLE DFU and swap back to the old version. We find it out while implementing OTA over LTE-M that the partition not swapping. There seams an issue with my swapping. The goal is to use the external flash for updating, but if the main flash works it will be good enough again.

Context:

I'm doing firmware updates via OTA DFU, and writing the upgrade request like this:

int err = boot_request_upgrade(BOOT_UPGRADE_TEST); // or int err = boot_set_pending(0);

MCUboot debug logs confirm that both the magic and swap info are written:

<dbg> mcuboot_util: boot_write_magic: writing magic; fa_id=6 off=0x77ff0 (0xfbff0)

<dbg> mcuboot_util: boot_write_swap_info: writing swap_info; fa_id=6 off=0x77fd8 (0xfbfd8), swap_type=0x2 image_num=0x0

However, after reboot, the old image from slot 0 is still running — no swap occurs.

I have CONFIG_MCUBOOT_UTIL_LOG_LEVEL_DBG=y enabled, but I’m unsure how to debug MCUboot itself (e.g., with west debug or bt) since getting not output west attach.

Note on Flash Patch:

I also experimented with:

# CONFIG_DISABLE_FLASH_PATCH=y

When I enable this config, the DFU (BLE) no longer works — so I’ve kept it disabled.

prj.conf (partial):

CONFIG_PARTITION_MANAGER_ENABLED=y

CONFIG_PM_OVERRIDE_EXTERNAL_DRIVER_CHECK=n

CONFIG_PM_EXTERNAL_FLASH_MCUBOOT_SECONDARY=n

CONFIG_PM_PARTITION_REGION_LITTLEFS_EXTERNAL=y

pm_static.yml (simplified):

mcuboot: 0x00000 - 0x0c000

mcuboot_primary: 0x0c000 - 0x84000

mcuboot_secondary: 0x84000 - 0xfc000

settings_storage: 0xfc000 - 0x100000

My questions:

1. What could prevent MCUboot from initiating the swap even when magic/swap_info are written? (Could a mismatch in partition maps between MCUboot and the application prevent the swap?)

2. Is there a correct way to attach to MCUboot for runtime debugging? (e.g., debugging from reset?)

3. Any known issues with OTA DFU + MCUboot + CONFIG_DISABLE_FLASH_PATCH?

4. Are there additional configs I should double-check?

5. How can I verify that MCUboot has the correct view of the flash layout?

Thanks in advance — happy to share more if needed!

[AHaug]

Hi,

What could prevent MCUboot from initiating the swap even when magic/swap_info are written? (Could a mismatch in partition maps between MCUboot and the application prevent the swap?)

Here's a couple of thoughts 

1. Mismatch in size between primary and secondary (both of your partitions are similar if my math checks out)
2. That you don't enough room for swapping (NCSDK-20567 in https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/releases_and_maturity/known_issues.html note that there are two instances of 20567 in this list)
3. That the image is rejected due to either
   1. That the update image is not signed with the same key that MCUboot has (injection protection)
   2. That the update image is rejected due to versioning not being newer than the current version (downgrade protection)

Item 3 is typically occurring after the image has been swapped, so based on your description I don't think that this is the case.

Is there a correct way to attach to MCUboot for runtime debugging? (e.g., debugging from reset?)

 Trying to debug with MCUBOOT enabled fails to boot. and  B0 secure bootloader logging with RTT not working. might be helpful as well as https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-2-debugging/ 

Any known issues with OTA DFU + MCUboot + CONFIG_DISABLE_FLASH_PATCH?

Not that I'm aware of, i.e nothing stated in the known issues page and I can't think of any conflicts based on the description https://docs.nordicsemi.com/bundle/ncs-latest/page/kconfig/index.html#CONFIG_DISABLE_FLASH_PATCH 

Are there additional configs I should double-check?

https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-8-bootloaders-and-dfu-fota/ there could be some pointers here

How can I verify that MCUboot has the correct view of the flash layout?

MCUboot uses the pm_static.yml that you build it with, so verify it by comparing the partition manager report, i.e west build -t partition_manager_report, up against the generated build partition map that you can find within build/mcuboot/ and/or build/<your_app>

Kind regards,
Andreas

[QBSho]

Thanks Andreas, 

tried all things - but don't get it working!

[AHaug]

Hi,

Could you please post more details? Do you get any build logs, device logs or anything when you're trying the various items? 

Oh, are you certain that the image is uploaded?

And thirdly; do you mark the new image to be confirmed for update? This should be more described in steps in for instance the Bootloader and DFU lesson here  https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/topic/exercise-1-dfu-over-uart/ 

1. Using mcumgr CLI

You can confirm the currently running image with the following command (no hash needed for the running image): mcumgr <connection-options> image confirm ""

Or, to confirm a specific image by its hash: mcumgr <connection-options> image confirm <hash>

Confirming the image ensures that the bootloader will not revert to the previous image on subsequent resets. If you do not confirm, the device will revert to the previous image after a reset. This is especially important in dual-slot configurations where images are swapped during DFU. The confirmed flag will be set for the image once this is done Verifying and testing the image.

2. In Application Code

You can also confirm the image programmatically after verifying that the new firmware is working as expected. This is typically done by calling the boot_write_img_confirmed() function in your application code:

#include <bootutil/bootutil.h>

if (!boot_is_img_confirmed()) {
int err = boot_write_img_confirmed();
if (err == 0) {
// Image successfully confirmed
} else {
// Handle error
}
}

This approach is useful if you want the device to self-confirm after passing certain checks (e.g., after a successful BLE connection or other validation) MCUboot test and confirm with DFU Target library.

3. DFU Target Sample

If you are using the DFU Target sample, you can use the shell command: dfu_target mcuboot_confirm

This will mark the update as confirmed. If you skip this step, the device will revert to the previous image on the next reboot DFU Target Sample - Testing.

Kind regards,

Andreas

[QBSho]

SEGGER J-Link V7.94i - Real time terminal output
SEGGER J-Link (unknown) V1.0, SN=1050238934
Process: JLinkExe
*** Booting My Application v0.2.3-stable-4ac746336259 ***
*** Using nRF Connect SDK v2.9.0-7787b2649840 ***
*** Using Zephyr OS v3.7.99-1f8f3dc29142 ***
*** Golioth Firmware SDK v0.18.0 ***
[00:00:00.059,814] <inf> edge_app: GPIO 2V4 already set 0xFFFFFFFA
[00:00:00.059,844] <inf> edge_app: Starting application...
[00:00:00.059,844] <inf> edge_app: Build time: Jul  7 2025 20:47:26
[00:00:00.059,875] <inf> edge_app: Version: 0.2.3
[00:00:00.059,906] <inf> edge_app: SerialNo edfb3e72
[00:00:00.066,833] <inf> fs_nvs: 4 Sectors of 4096 bytes
[00:00:00.066,833] <inf> fs_nvs: alloc wra: 0, fe8
[00:00:00.066,833] <inf> fs_nvs: data wra: 0, 0
[00:00:00.066,894] <inf> edge_app: SIMCOM module initalised
[00:00:00.066,925] <inf> edge_app: Golioth psk_id:
[00:00:00.066,955] <inf> edge_app: Golioth psk:
[00:00:00.067,016] <inf> led_app: led init done
[00:00:00.567,138] <inf> app_button: Set up 0m
m

0m

[00:00:02.059,936] <inf> app_networking: Waiting for network registration...
[00:00:13.560,150] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,180] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,272] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,302] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,363] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,394] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,455] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,485] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,546] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,577] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,638] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,668] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.660,614] <err> modem_chat: Failed to transmit 2 bytes. (-1)
[00:00:23.560,272] <wrn> modem_chat: simcom_sim7080_init_chat_script: timed out
[00:00:36.973,876] <inf> modem_at_shell: pipe connected
[00:00:36.973,968] <inf> modem_at_shell: opening pipe
[00:00:37.006,561] <inf> modem_at_shell: pipe opened
[00:00:37.006,652] <inf> modem_at_shell: chat attached
[00:00:49.060,729] <inf> app_networking: Registered (roaming) via LTE
[00:00:49.061,370] <inf> app_networking: Waiting for network connection...
[00:00:49.257,049] <inf> app_networking: IP up NET_EVENT_DNS_SERVER_ADD
[00:00:49.257,049] <inf> app_networking: IP up NET_EVENT_L4_CONNECTED
[00:00:49.257,080] <inf> app_networking: Connected to network
[00:00:49.296,386] <inf> app_networking: IP up NET_EVENT_L4_CONNECTED
[00:00:49.296,417] <inf> app_networking: Connected to network
[00:00:50.257,843] <inf> app_sntp: Sending SNTP IPv4 request...
[00:00:51.440,399] <inf> app_sntp: status: 0
[00:00:51.440,429] <inf> app_sntp: time since Epoch: high word: 0, low word: 1751914119
[00:00:51.440,521] <inf> app_sntp: Time received from 0

[00:00:51.440,551] <inf> app_sntp: Current time after sync:: 1751914119000
[00:00:51.441,070] <inf> golioth_mbox: Mbox created, bufsize: 1232, num_items: 10, item_size: 112
[00:00:56.568,572] <inf> golioth_coap_client_zephyr: Connected to server 0
[00:00:56.568,603] <inf> golioth_coap_client_zephyr: Golioth CoAP client connected
[00:00:56.568,603] <inf> lte_data_thread: golioth Connected
[00:00:56.568,695] <inf> golioth_coap_client_zephyr: Entering CoAP I/O loop
[00:00:56.688,964] <inf> app_networking: RSSI: -81
[00:00:56.689,025] <inf> app_networking: IMEI: 860016042893276
[00:00:58.266,174] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:00:58.266,204] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:00:58.266,265] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:00:58.266,296] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:00:58.411,132] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:00:58.411,163] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:00:58.411,254] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:00:58.411,285] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:00:58.602,142] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:00:58.602,203] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:00:58.602,233] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:00:58.602,325] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:00:59.835,235] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:00:59.835,266] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:00:59.835,327] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:00:59.835,388] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:00:59.975,158] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:00:59.975,189] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:00:59.975,280] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:00:59.975,311] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:01:00.374,908] <inf> lte_data_thread: New manifest received
[00:01:00.375,000] <inf> lte_data_thread: New firmware version available: 0.3.0 (current: 0.2.3)
[00:01:00.377,929] <inf> lte_data_thread: Starting OTA download: 0.2.3 -> 0.3.0
[00:01:02.163,085] <inf> lte_data_thread: OTA download started successfully
[00:01:02.163,116] <inf> lte_data_thread: Waiting for OTA to complete...
[00:01:05.616,455] <inf> lte_data_thread: Received block 0/20
[00:01:05.616,546] <inf> mcuboot_util: Image index: 0, Swap type: none
[00:01:05.616,577] <inf> golioth_fw_zephyr: swap type: none
[00:01:07.725,402] <inf> lte_data_thread: Received block 1/20
[00:01:11.790,405] <inf> lte_data_thread: Received block 2/20
[00:01:15.811,889] <inf> lte_data_thread: Received block 3/20
[00:01:17.965,026] <inf> lte_data_thread: Received block 4/20
[00:01:21.919,433] <inf> lte_data_thread: Received block 5/20
[00:01:26.047,454] <inf> lte_data_thread: Received block 6/20
[00:01:28.256,591] <inf> lte_data_thread: Received block 7/20
[00:01:32.127,532] <inf> lte_data_thread: Received block 8/20
[00:01:36.367,858] <inf> lte_data_thread: Received block 9/20
[00:01:38.399,353] <inf> lte_data_thread: Received block 10/20
[00:01:40.445,373] <inf> lte_data_thread: Received block 11/20
[00:01:42.479,309] <inf> lte_data_thread: Received block 12/20
[00:01:46.159,332] <inf> lte_data_thread: Received block 13/20
[00:01:48.639,343] <inf> lte_data_thread: Received block 14/20
[00:01:50.686,157] <inf> lte_data_thread: Received block 15/20
[00:01:54.799,407] <inf> lte_data_thread: Received block 16/20
[00:01:58.924,774] <inf> lte_data_thread: Received block 17/20
[00:02:00.925,476] <inf> lte_data_thread: Received block 18/20
[00:02:02.945,678] <inf> lte_data_thread: Received block 19/20
[00:02:04.725,463] <inf> lte_data_thread: Received block 20/20
[00:02:04.849,090] <inf> lte_data_thread: OTA download complete for 'main'. Verifying and requesting upgrade...
[00:02:04.849,121] <inf> lte_data_thread: OTA1 download complete for 'main'. Verifying and requesting upgrade...
[00:02:04.883,514] <dbg> mcuboot_util: boot_write_magic: writing magic; fa_id=6 off=0x77ff0 (0xfbff0)
[00:02:04.884,124] <dbg> mcuboot_util: boot_write_swap_info: writing swap_info; fa_id=6 off=0x77fd8 (0xfbfd8), swap_type=0x2 image_num=0x0
[00:02:04.884,613] <inf> lte_data_thread: OT2 download complete for 'main'. Verifying and requesting upgrade...
[00:02:04.884,674] <inf> lte_data_thread: Boot upgrade requested successfully - releasing semaphore for reboot
[00:02:04.884,826] <inf> golioth_coap_client_zephyr: Attempting to stop client
[00:02:04.884,948] <inf> golioth_coap_client_zephyr: Stop request
[00:02:04.884,948] <inf> golioth_coap_client_zephyr: Ending session
*** Booting My Application v0.2.3-stable-4ac746336259 ***
*** Using nRF Connect SDK v2.9.0-7787b2649840 ***
*** Using Zephyr OS v3.7.99-1f8f3dc29142 ***
*** Golioth Firmware SDK v0.18.0 ***
[00:00:00.059,600] <inf> edge_app: GPIO 2V4 already set 0xFFFFFFFA
[00:00:00.059,600] <inf> edge_app: Starting application...
[00:00:00.059,631] <inf> edge_app: Build time: Jul  7 2025 20:47:26
[00:00:00.059,661] <inf> edge_app: Version: 0.2.3
[00:00:00.059,661] <inf> edge_app: SerialNo edfb3e72
[00:00:00.066,101] <inf> fs_nvs: 4 Sectors of 4096 bytes
[00:00:00.066,131] <inf> fs_nvs: alloc wra: 0, fe8
[00:00:00.066,131] <inf> fs_nvs: data wra: 0, 0
[00:00:00.066,192] <inf> edge_app: SIMCOM module initalised
[00:00:00.066,223] <inf> edge_app: Golioth psk_id:
[00:00:00.066,253] <inf> edge_app: Golioth psk:
[00:00:00.066,284] <inf> led_app: led init done
[00:00:00.566,406] <inf> app_button: Set up button at gpio@50000300 pin 4

[00:00:00.566,467] <inf> littlefs: LittleFS version 2.9, disk version 2.1
[00:00:00.568,511] <inf> littlefs: FS at mx25r6435f@0:0x0 is 2048 0x1000-byte blocks with 512 cycle
[00:00:00.568,511] <inf> littlefs: sizes: rd 16 ; pr 16 ; ca 64 ; la 32
[00:00:00.576,232] <inf> data_archive: bsize = 16 ; frsize = 4096 ; blocks = 2048 ; bfree = 2044
[00:00:00.580,108] <inf> edge_app: Data archive initialized (Code: 0)
[00:00:00.580,322] <inf> bt_sdc_hci_driver: SoftDevice Controller build revision: 
                                            2d 79 a1 c8 6a 40 b7 3c  f6 74 f9 0b 22 d3 c4 80 |-y..j@.< .t.."...
                                            74 72 82 ba                                      |tr..             
[00:00:00.582,489] <inf> bt_hci_core: HW Platform: Nordic Semiconductor (0x0002)
[00:00:00.582,519] <inf> bt_hci_core: HW Variant: nRF52x (0x0002)
[00:00:00.582,550] <inf> bt_hci_core: Firmware: Standard Bluetooth controller (0x00) Version 45.41337 Build 3074452168
[00:00:00.583,343] <inf> bt_hci_core: Identity: FE:72:34:2F:0F:6E (random)
[00:00:00.583,374] <inf> bt_hci_core: HCI: version 6.0 (0x0e) revision 0x106b, manufacturer 0x0059
[00:00:00.583,404] <inf> bt_hci_core: LMP: version 6.0 (0x0e) subver 0x106b
[00:00:00.583,435] <inf> ble_server: Bluetooth initialized
[00:00:00.583,465] <wrn> ble_server: Failed to set device name (-12)
[00:00:00.584,289] <inf> ble_data_thread: Starting BLE write thread...
[00:00:02.059,722] <inf> app_networking: Waiting for network registration...
[00:00:13.559,936] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.559,967] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,058] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,089] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,150] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,180] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,241] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,272] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,333] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,363] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.560,424] <wrn> modem_backend_uart_async: Receive stopped for reasons: 4
[00:00:13.560,455] <wrn> modem_backend_uart_async: Receive stopped for reasons: 8
[00:00:13.660,400] <err> modem_chat: Failed to transmit 2 bytes. (-1)
[00:00:23.560,058] <wrn> modem_chat: simcom_sim7080_init_chat_script: timed out
[00:00:37.733,093] <inf> modem_at_shell: pipe connected
[00:00:37.733,184] <inf> modem_at_shell: opening pipe
[00:00:37.765,869] <inf> modem_at_shell: pipe opened
[00:00:37.765,960] <inf> modem_at_shell: chat attached
[00:00:57.060,577] <inf> app_networking: Registered (roaming) via LTE
[00:00:57.061,309] <inf> app_networking: Waiting for network connection...
[00:00:57.274,230] <inf> app_networking: IP up NET_EVENT_DNS_SERVER_ADD
[00:00:57.274,230] <inf> app_networking: IP up NET_EVENT_L4_CONNECTED
[00:00:57.274,291] <inf> app_networking: Connected to network
[00:00:57.327,606] <inf> app_networking: IP up NET_EVENT_L4_CONNECTED
[00:00:57.327,606] <inf> app_networking: Connected to network
[00:00:58.275,146] <inf> app_sntp: Sending SNTP IPv4 request...
[00:01:02.610,321] <inf> app_sntp: status: 0
[00:01:02.610,351] <inf> app_sntp: time since Epoch: high word: 0, low word: 1751914266
[00:01:02.610,443] <inf> app_sntp: Time received from 0

[00:01:02.610,473] <inf> app_sntp: Current time after sync:: 1751914266000
[00:01:02.610,992] <inf> golioth_mbox: Mbox created, bufsize: 1232, num_items: 10, item_size: 112
[00:01:08.171,936] <inf> golioth_coap_client_zephyr: Connected to server -1
[00:01:08.171,936] <err> golioth_coap_client_zephyr: Failed to connect to socket: -11
[00:01:08.172,851] <err> golioth_coap_client_zephyr: Failed to connect: -11
[00:01:08.172,882] <wrn> golioth_coap_client_zephyr: Failed to connect: -11
[00:01:17.823,303] <inf> golioth_coap_client_zephyr: Connected to server 0
[00:01:17.823,333] <inf> golioth_coap_client_zephyr: Golioth CoAP client connected
[00:01:17.823,333] <inf> lte_data_thread: golioth Connected
[00:01:17.823,333] <inf> golioth_coap_client_zephyr: Entering CoAP I/O loop
[00:01:17.870,178] <inf> app_networking: RSSI: -79
[00:01:17.870,208] <inf> app_networking: IMEI: 860016042893276
[00:01:18.828,979] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:01:18.829,010] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:01:18.829,101] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:01:18.829,132] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:01:18.908,966] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:01:18.908,996] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:01:18.909,088] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:01:18.909,118] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:01:19.273,925] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:01:19.273,986] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:01:19.274,047] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:01:19.274,108] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:01:19.404,174] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:01:19.404,296] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:01:19.404,357] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:01:19.404,418] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:01:19.529,907] <inf> app_golioth: Setting on_send_adc_data_setting to 300 s
[00:01:19.529,998] <inf> app_golioth: Setting SEND_ADC_DATA_ON_NEXT_ONLINE to false
[00:01:19.530,029] <inf> app_golioth: Setting on_send_adc_record_setting to 360 s
[00:01:19.530,090] <inf> app_golioth: Setting FORCE_SEND_STATUS to true
[00:01:20.542,877] <inf> lte_data_thread: New manifest received
[00:01:20.543,090] <inf> lte_data_thread: New firmware version available: 0.3.0 (current: 0.2.3)
[00:01:20.543,304] <inf> lte_data_thread: Starting OTA download: 0.2.3 -> 0.3.0
[00:01:23.078,186] <inf> lte_data_thread: OTA download started successfully
[00:01:23.078,216] <inf> lte_data_thread: Waiting for OTA to complete...
[00:01:25.856,231] <inf> lte_data_thread: Received block 0/20
[00:01:25.856,323] <inf> mcuboot_util: Image index: 0, Swap type: none
[00:01:25.856,323] <inf> golioth_fw_zephyr: swap type: none
[00:01:27.854,187] <inf> lte_data_thread: Received block 1/20
[00:01:29.808,105] <inf> lte_data_thread: Received block 2/20
[00:01:33.972,839] <inf> lte_data_thread: Received block 3/20
[00:01:36.014,373] <inf> lte_data_thread: Received block 4/20
[00:01:38.094,177] <inf> lte_data_thread: Received block 5/20
[00:01:42.129,180] <inf> lte_data_thread: Received block 6/20
[00:01:44.335,144] <inf> lte_data_thread: Received block 7/20
[00:01:48.255,157] <inf> lte_data_thread: Received block 8/20
[00:01:50.414,154] <inf> lte_data_thread: Received block 9/20
[00:01:52.464,630] <inf> lte_data_thread: Received block 10/20
[00:01:56.544,219] <inf> lte_data_thread: Received block 11/20
[00:01:58.575,286] <inf> lte_data_thread: Received block 12/20
[00:02:02.774,383] <inf> lte_data_thread: Received block 13/20
[00:02:06.818,359] <inf> lte_data_thread: Received block 14/20
[00:02:11.010,314] <inf> lte_data_thread: Received block 15/20
[00:02:14.928,039] <inf> lte_data_thread: Received block 16/20
[00:02:19.137,145] <inf> lte_data_thread: Received block 17/20
[00:02:21.056,365] <inf> lte_data_thread: Received block 18/20
[00:02:25.134,307] <inf> lte_data_thread: Received block 19/20
[00:02:26.919,219] <inf> lte_data_thread: Received block 20/20
[00:02:27.060,119] <inf> lte_data_thread: OTA download complete for 'main'. Verifying and requesting upgrade...
[00:02:27.060,150] <inf> lte_data_thread: OTA1 download complete for 'main'. Verifying and requesting upgrade...
[00:02:27.094,543] <dbg> mcuboot_util: boot_write_magic: writing magic; fa_id=6 off=0x77ff0 (0xfbff0)
[00:02:27.095,123] <dbg> mcuboot_util: boot_write_swap_info: writing swap_info; fa_id=6 off=0x77fd8 (0xfbfd8), swap_type=0x2 image_num=0x0
[00:02:27.095,642] <inf> lte_data_thread: OT2 download complete for 'main'. Verifying and requesting upgrade...
[00:02:27.095,672] <inf> lte_data_thread: Boot upgrade requested successfully - releasing semaphore for reboot
[00:02:27.095,825] <inf> golioth_coap_client_zephyr: Attempting to stop client
[00:02:27.095,947] <inf> golioth_coap_client_zephyr: Stop request
[00:02:27.095,947] <inf> golioth_coap_client_zephyr: Ending session
*** Booting My Application v0.2.3-stable-4ac746336259 ***
*** Using nRF Connect SDK v2.9.0-7787b2649840 ***
*** Using Zephyr OS v3.7.99-1f8f3dc29142 ***
*** Golioth Firmware SDK v0.18.0 ***
[00:00:00.059,600] <inf> edge_app: GPIO 2V4 already set 0xFFFFFFFA
[00:00:00.059,600] <inf> edge_app: Starting application...
[00:00:00.059,631] <inf> edge_app: Build time: Jul  7 2025 20:47:26
[00:00:00.059,661] <inf> edge_app: Version: 0.2.3
[00:00:00.059,661] <inf> edge_app: SerialNo edfb3e72
[00:00:00.066,101] <inf> fs_nvs: 4 Sectors of 4096 bytes
[00:00:00.066,101] <inf> fs_nvs: alloc wra: 0, fe8
[00:00:00.066,131] <inf> fs_nvs: data wra: 0, 0
[00:00:00.066,192] <inf> edge_app: SIMCOM module initalised
[00:00:00.066,223] <inf> edge_app: Golioth psk_id:
[00:00:00.066,253] <inf> edge_app: Golioth psk:
[00:00:00.066,284] <inf> led_app: led init done
[00:00:00.566,406] <inf> app_button: Set up button at gpio@50000300 pin 4

[00:00:00.566,467] <inf> littlefs: LittleFS version 2.9, disk version 2.1
[00:00:00.568,511] <inf> littlefs: FS at mx25r6435f@0:0x0 is 2048 0x1000-byte blocks with 512 cycle
[00:00:00.568,511] <inf> littlefs: sizes: rd 16 ; pr 16 ; ca 64 ; la 32
[00:00:00.576,232] <inf> data_archive: bsize = 16 ; frsize = 4096 ; blocks = 2048 ; bfree = 2044
[00:00:00.580,108] <inf> edge_app: Data archive initialized (Code: 0)
[00:00:00.580,322] <inf> bt_sdc_hci_driver: SoftDevice Controller build revision: 
                                            2d 79 a1 c8 6a 40 b7 3c  f6 74 f9 0b 22 d3 c4 80 |-y..j@.< .t.."...
                                            74 72 82 ba                                      |tr..             
[00:00:00.582,489] <inf> bt_hci_core: HW Platform: Nordic Semiconductor (0x0002)
[00:00:00.582,519] <inf> bt_hci_core: HW Variant: nRF52x (0x0002)
[00:00:00.582,550] <inf> bt_hci_core: Firmware: Standard Bluetooth controller (0x00) Version 45.41337 Build 3074452168
[00:00:00.583,343] <inf> bt_hci_core: Identity: FE:72:34:2F:0F:6E (random)
[00:00:00.583,374] <inf> bt_hci_core: HCI: version 6.0 (0x0e) revision 0x106b, manufacturer 0x0059
[00:00:00.583,404] <inf> bt_hci_core: LMP: version 6.0 (0x0e) subver 0x106b
[00:00:00.583,435] <inf> ble_server: Bluetooth initialized
[00:00:00.583,435] <wrn> ble_server: Failed to set device name (-12)
[00:00:00.584,289] <inf> ble_data_thread: Starting BLE write thread...
[00:00:02.059,722] <inf> app_networking: Waiting for network registration...

[QBSho]

I confirmed the firmware update with some basic logic and didn't see any log. The same method works before updating to 2.9.0. I assume the problem starts with migration to sysbuild. 

The only thing what i see is, which can be indication
[00:01:25.856,323] <inf> golioth_fw_zephyr: swap type: none

I don't see a mcu book msg between [00:02:27.095,947] and [00:00:00.059,600]. 


Regarding the size my firmeware is near the limit from 473kb. but already tried it with a blinky with the same signed key and the same issue!

My layout on the programm looks wired. (maybe this is a hint)