nRF Connect log shows DFU mode cannot be achieved. Same test on SDK15.2 worked.
Comparing the ld files of 15.2 and 15.3 shows uicr_bootloader_start_address and uicr_mbr_params_page
are quite different.
SDK15.2
uicr_bootloader_start_address (r) : ORIGIN = 0x100010014, LENGTH =0x4
uicr_mbr_params_page (r) : ORIGIN = 0x10001018, LENGTH = 0x4
SDK 15.3
uicr_bootloader_start_address (r) : ORIGIN = 0x00000FF8, LENGTH =0x4
uicr_mbr_params_page (r) : ORIGIN = 0x00000FFC, LENGTH = 0x4
Is this why SDK15.3 DFU is not working?
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nRF Connect, 2019-09-13
Nordic_Buttonless (D3:CD:8A:FD:E1:51)
V 12:20:27.822 Connecting to D3:CD:8A:FD:E1:51...
D 12:20:27.822 gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M)
D 12:20:29.342 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED
D 12:20:29.358 [Callback] Connection state changed with status: 0 and new state: CONNECTED (2)
I 12:20:29.358 Connected to D3:CD:8A:FD:E1:51
V 12:20:29.399 Discovering services...
D 12:20:29.399 gatt.discoverServices()
I 12:20:29.726 Connection parameters updated (interval: 7.5ms, latency: 0, timeout: 5000ms)
D 12:20:29.921 [Callback] Services discovered with status: 0
I 12:20:29.921 Services discovered
V 12:20:29.946 Generic Access (0x1800)
- Device Name [R W] (0x2A00)
- Appearance [R] (0x2A01)
- Peripheral Preferred Connection Parameters [R] (0x2A04)
- Central Address Resolution [R] (0x2AA6)
Generic Attribute (0x1801)
- Service Changed [I] (0x2A05)
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
nRF Connect, 2019-09-13 Nordic_Buttonless (D3:CD:8A:FD:E1:51) V 12:20:27.822 Connecting to D3:CD:8A:FD:E1:51... D 12:20:27.822 gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M) D 12:20:29.342 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED D 12:20:29.358 [Callback] Connection state changed with status: 0 and new state: CONNECTED (2) I 12:20:29.358 Connected to D3:CD:8A:FD:E1:51 V 12:20:29.399 Discovering services... D 12:20:29.399 gatt.discoverServices() I 12:20:29.726 Connection parameters updated (interval: 7.5ms, latency: 0, timeout: 5000ms) D 12:20:29.921 [Callback] Services discovered with status: 0 I 12:20:29.921 Services discovered V 12:20:29.946 Generic Access (0x1800) - Device Name [R W] (0x2A00) - Appearance [R] (0x2A01) - Peripheral Preferred Connection Parameters [R] (0x2A04) - Central Address Resolution [R] (0x2AA6) Generic Attribute (0x1801) - Service Changed [I] (0x2A05) Client Characteristic Configuration (0x2902) Secure DFU Service (0xFE59) - Buttonless DFU [I W] (8ec90003-f315-4f60-9fb8-838830daea50) Client Characteristic Configuration (0x2902) D 12:20:29.946 gatt.setCharacteristicNotification(00002a05-0000-1000-8000-00805f9b34fb, true) I 12:20:29.993 Connection parameters updated (interval: 45.0ms, latency: 0, timeout: 5000ms) I 12:20:34.452 Connection parameters updated (interval: 195.0ms, latency: 0, timeout: 4000ms) V 12:20:39.692 [DFU] DFU service started V 12:20:39.692 [DFU] Opening file... I 12:20:39.699 [DFU] Firmware file opened successfully V 12:20:39.699 [DFU] Connecting to DFU target... D 12:20:39.703 [DFU] gatt = device.connectGatt(autoConnect = false) I 12:20:39.719 [DFU] Connected to D3:CD:8A:FD:E1:51 V 12:20:39.720 [DFU] Discovering services... D 12:20:39.720 [DFU] gatt.discoverServices() I 12:20:39.731 [DFU] Services discovered D 12:20:39.747 [DFU] wait(1000) W 12:20:40.805 [DFU] Application with buttonless update found V 12:20:40.805 [DFU] Jumping to the DFU Bootloader... V 12:20:40.805 [DFU] Enabling indications for 8ec90003-f315-4f60-9fb8-838830daea50 D 12:20:40.805 [DFU] gatt.setCharacteristicNotification(8ec90003-f315-4f60-9fb8-838830daea50, true) D 12:20:40.805 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00) I 12:20:41.094 [DFU] Data written to descr.8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 02-00 V 12:20:41.094 [DFU] Notifications enabled for 8ec90003-f315-4f60-9fb8-838830daea50 A 12:20:41.094 [DFU] Indications enabled D 12:20:41.094 [DFU] wait(1000) V 12:20:42.118 [DFU] Writing to characteristic 8ec90003-f315-4f60-9fb8-838830daea50 D 12:20:42.118 [DFU] gatt.writeCharacteristic(8ec90003-f315-4f60-9fb8-838830daea50) I 12:20:42.463 [DFU] Notification received from 8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 20-01-01 A 12:20:42.464 [DFU] Enter bootloader sent (Op Code = 1) A 12:20:42.465 [DFU] Response received (Op Code = 1, Status = 1) D 12:20:46.677 [Callback] Connection state changed with status: 8 and new state: DISCONNECTED (0) E 12:20:46.678 Error 8 (0x8): GATT CONN TIMEOUT I 12:20:46.678 Disconnected I 12:20:46.756 [DFU] Disconnected by the remote device D 12:20:46.756 [DFU] gatt.refresh() (hidden) D 12:20:46.756 [DFU] gatt.close() V 12:20:46.756 [DFU] Scanning for the DFU Bootloader... D 12:20:46.756 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED D 12:20:46.768 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED I 12:20:51.763 [DFU] DFU Bootloader not found. Trying the same address... V 12:20:51.798 [DFU] DFU service started I 12:20:51.798 [DFU] Firmware file opened successfully D 12:20:51.799 [DFU] wait(1000) D 12:20:52.801 [DFU] wait(1000) V 12:20:53.801 [DFU] Connecting to DFU target... D 12:20:53.837 [DFU] gatt = device.connectGatt(autoConnect = false) D 12:20:54.577 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED D 12:20:54.597 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED I 12:20:54.597 [DFU] Connected to D3:CD:8A:FD:E1:51 V 12:20:54.597 [DFU] Discovering services... D 12:20:54.597 [DFU] gatt.discoverServices() I 12:20:55.170 [DFU] Services discovered D 12:20:55.192 [DFU] wait(1000) W 12:20:56.190 [DFU] Application with buttonless update found V 12:20:56.190 [DFU] Jumping to the DFU Bootloader... V 12:20:56.190 [DFU] Enabling indications for 8ec90003-f315-4f60-9fb8-838830daea50 D 12:20:56.191 [DFU] gatt.setCharacteristicNotification(8ec90003-f315-4f60-9fb8-838830daea50, true) D 12:20:56.195 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00) I 12:20:56.281 [DFU] Data written to descr.8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 02-00 V 12:20:56.282 [DFU] Notifications enabled for 8ec90003-f315-4f60-9fb8-838830daea50 A 12:20:56.283 [DFU] Indications enabled D 12:20:56.283 [DFU] wait(1000) V 12:20:57.320 [DFU] Writing to characteristic 8ec90003-f315-4f60-9fb8-838830daea50 D 12:20:57.320 [DFU] gatt.writeCharacteristic(8ec90003-f315-4f60-9fb8-838830daea50) A 12:20:57.398 [DFU] Enter bootloader sent (Op Code = 1) I 12:20:57.399 [DFU] Notification received from 8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 20-01-01 A 12:20:57.402 [DFU] Response received (Op Code = 1, Status = 1) I 12:21:02.472 [DFU] Disconnected by the remote device D 12:21:02.475 [DFU] gatt.refresh() (hidden) D 12:21:02.485 [DFU] gatt.close() D 12:21:02.486 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED D 12:21:02.491 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED V 12:21:02.519 [DFU] Scanning for the DFU Bootloader... I 12:21:02.747 [DFU] DFU Bootloader found with address D3:CD:8A:FD:E1:51 V 12:21:02.766 [DFU] DFU service started I 12:21:02.766 [DFU] Firmware file opened successfully D 12:21:02.766 [DFU] wait(1000) D 12:21:03.768 [DFU] wait(1000) V 12:21:04.816 [DFU] Connecting to DFU target... D 12:21:04.817 [DFU] gatt = device.connectGatt(autoConnect = false) D 12:21:05.768 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED D 12:21:05.794 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED I 12:21:05.794 [DFU] Connected to D3:CD:8A:FD:E1:51 V 12:21:05.794 [DFU] Discovering services... D 12:21:05.794 [DFU] gatt.discoverServices() I 12:21:06.335 [DFU] Services discovered D 12:21:06.377 [DFU] wait(1000) W 12:21:07.361 [DFU] Application with buttonless update found V 12:21:07.361 [DFU] Jumping to the DFU Bootloader... V 12:21:07.361 [DFU] Enabling indications for 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:07.361 [DFU] gatt.setCharacteristicNotification(8ec90003-f315-4f60-9fb8-838830daea50, true) D 12:21:07.368 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00) I 12:21:07.434 [DFU] Data written to descr.8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 02-00 V 12:21:07.434 [DFU] Notifications enabled for 8ec90003-f315-4f60-9fb8-838830daea50 A 12:21:07.434 [DFU] Indications enabled D 12:21:07.439 [DFU] wait(1000) V 12:21:08.474 [DFU] Writing to characteristic 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:08.474 [DFU] gatt.writeCharacteristic(8ec90003-f315-4f60-9fb8-838830daea50) A 12:21:08.515 [DFU] Enter bootloader sent (Op Code = 1) I 12:21:08.517 [DFU] Notification received from 8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 20-01-01 A 12:21:08.517 [DFU] Response received (Op Code = 1, Status = 1) I 12:21:13.580 [DFU] Disconnected by the remote device D 12:21:13.582 [DFU] gatt.refresh() (hidden) D 12:21:13.589 [DFU] gatt.close() D 12:21:13.595 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED D 12:21:13.621 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED V 12:21:13.621 [DFU] Scanning for the DFU Bootloader... I 12:21:13.864 [DFU] DFU Bootloader found with address D3:CD:8A:FD:E1:51 V 12:21:13.893 [DFU] DFU service started I 12:21:13.893 [DFU] Firmware file opened successfully D 12:21:13.893 [DFU] wait(1000) D 12:21:14.894 [DFU] wait(1000) V 12:21:15.931 [DFU] Connecting to DFU target... D 12:21:15.935 [DFU] gatt = device.connectGatt(autoConnect = false) D 12:21:18.574 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED I 12:21:18.611 [DFU] Connected to D3:CD:8A:FD:E1:51 V 12:21:18.611 [DFU] Discovering services... D 12:21:18.611 [DFU] gatt.discoverServices() D 12:21:18.611 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED I 12:21:19.165 [DFU] Services discovered D 12:21:19.199 [DFU] wait(1000) W 12:21:20.186 [DFU] Application with buttonless update found V 12:21:20.186 [DFU] Jumping to the DFU Bootloader... V 12:21:20.186 [DFU] Enabling indications for 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:20.186 [DFU] gatt.setCharacteristicNotification(8ec90003-f315-4f60-9fb8-838830daea50, true) D 12:21:20.191 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00) I 12:21:20.262 [DFU] Data written to descr.8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 02-00 V 12:21:20.262 [DFU] Notifications enabled for 8ec90003-f315-4f60-9fb8-838830daea50 A 12:21:20.263 [DFU] Indications enabled D 12:21:20.263 [DFU] wait(1000) V 12:21:21.294 [DFU] Writing to characteristic 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:21.296 [DFU] gatt.writeCharacteristic(8ec90003-f315-4f60-9fb8-838830daea50) A 12:21:21.385 [DFU] Enter bootloader sent (Op Code = 1) I 12:21:21.385 [DFU] Notification received from 8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 20-01-01 A 12:21:21.385 [DFU] Response received (Op Code = 1, Status = 1) I 12:21:26.453 [DFU] Disconnected by the remote device D 12:21:26.456 [DFU] gatt.refresh() (hidden) D 12:21:26.459 [DFU] gatt.close() D 12:21:26.465 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED D 12:21:26.498 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED V 12:21:26.498 [DFU] Scanning for the DFU Bootloader... I 12:21:26.723 [DFU] DFU Bootloader found with address D3:CD:8A:FD:E1:51 V 12:21:26.736 [DFU] DFU service started I 12:21:26.736 [DFU] Firmware file opened successfully D 12:21:26.736 [DFU] wait(1000) D 12:21:27.737 [DFU] wait(1000) V 12:21:28.772 [DFU] Connecting to DFU target... D 12:21:28.773 [DFU] gatt = device.connectGatt(autoConnect = false) D 12:21:29.152 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED I 12:21:29.172 [DFU] Connected to D3:CD:8A:FD:E1:51 V 12:21:29.172 [DFU] Discovering services... D 12:21:29.172 [DFU] gatt.discoverServices() D 12:21:29.173 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED I 12:21:29.726 [DFU] Services discovered D 12:21:29.807 [DFU] wait(1000) W 12:21:30.739 [DFU] Application with buttonless update found V 12:21:30.739 [DFU] Jumping to the DFU Bootloader... V 12:21:30.739 [DFU] Enabling indications for 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:30.739 [DFU] gatt.setCharacteristicNotification(8ec90003-f315-4f60-9fb8-838830daea50, true) D 12:21:30.741 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00) I 12:21:30.832 [DFU] Data written to descr.8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 02-00 V 12:21:30.832 [DFU] Notifications enabled for 8ec90003-f315-4f60-9fb8-838830daea50 A 12:21:30.832 [DFU] Indications enabled D 12:21:30.832 [DFU] wait(1000) V 12:21:31.855 [DFU] Writing to characteristic 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:31.855 [DFU] gatt.writeCharacteristic(8ec90003-f315-4f60-9fb8-838830daea50) A 12:21:31.913 [DFU] Enter bootloader sent (Op Code = 1) I 12:21:31.913 [DFU] Notification received from 8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 20-01-01 A 12:21:31.914 [DFU] Response received (Op Code = 1, Status = 1) I 12:21:36.986 [DFU] Disconnected by the remote device D 12:21:36.990 [DFU] gatt.refresh() (hidden) D 12:21:36.999 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED D 12:21:37.031 [DFU] gatt.close() V 12:21:37.031 [DFU] Scanning for the DFU Bootloader... D 12:21:37.032 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED I 12:21:41.875 [DFU] DFU Bootloader found with address D3:CD:8A:FD:E1:51 V 12:21:41.912 [DFU] DFU service started I 12:21:41.912 [DFU] Firmware file opened successfully D 12:21:41.912 [DFU] wait(1000) D 12:21:42.912 [DFU] wait(1000) V 12:21:43.923 [DFU] Connecting to DFU target... D 12:21:43.924 [DFU] gatt = device.connectGatt(autoConnect = false) D 12:21:45.976 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED D 12:21:46.002 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED I 12:21:46.003 [DFU] Connected to D3:CD:8A:FD:E1:51 V 12:21:46.003 [DFU] Discovering services... D 12:21:46.003 [DFU] gatt.discoverServices() I 12:21:46.562 [DFU] Services discovered D 12:21:46.583 [DFU] wait(1000) W 12:21:47.577 [DFU] Application with buttonless update found V 12:21:47.578 [DFU] Jumping to the DFU Bootloader... V 12:21:47.578 [DFU] Enabling indications for 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:47.578 [DFU] gatt.setCharacteristicNotification(8ec90003-f315-4f60-9fb8-838830daea50, true) D 12:21:47.580 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00) I 12:21:47.662 [DFU] Data written to descr.8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 02-00 V 12:21:47.662 [DFU] Notifications enabled for 8ec90003-f315-4f60-9fb8-838830daea50 A 12:21:47.663 [DFU] Indications enabled D 12:21:47.663 [DFU] wait(1000) V 12:21:48.679 [DFU] Writing to characteristic 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:48.679 [DFU] gatt.writeCharacteristic(8ec90003-f315-4f60-9fb8-838830daea50) I 12:21:48.787 [DFU] Notification received from 8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 20-01-01 A 12:21:48.787 [DFU] Enter bootloader sent (Op Code = 1) A 12:21:48.787 [DFU] Response received (Op Code = 1, Status = 1) I 12:21:53.868 [DFU] Disconnected by the remote device D 12:21:53.879 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED D 12:21:53.910 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED D 12:21:53.910 [DFU] gatt.refresh() (hidden) D 12:21:53.910 [DFU] gatt.close() V 12:21:53.910 [DFU] Scanning for the DFU Bootloader... I 12:21:54.137 [DFU] DFU Bootloader found with address D3:CD:8A:FD:E1:51 V 12:21:54.154 [DFU] DFU service started I 12:21:54.154 [DFU] Firmware file opened successfully D 12:21:54.154 [DFU] wait(1000) D 12:21:55.153 [DFU] wait(1000) V 12:21:56.256 [DFU] Connecting to DFU target... D 12:21:56.257 [DFU] gatt = device.connectGatt(autoConnect = false) D 12:21:56.717 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED D 12:21:56.737 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED I 12:21:56.737 [DFU] Connected to D3:CD:8A:FD:E1:51 V 12:21:56.737 [DFU] Discovering services... D 12:21:56.737 [DFU] gatt.discoverServices() I 12:21:57.325 [DFU] Services discovered D 12:21:57.350 [DFU] wait(1000) W 12:21:58.344 [DFU] Application with buttonless update found V 12:21:58.344 [DFU] Jumping to the DFU Bootloader... V 12:21:58.344 [DFU] Enabling indications for 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:58.344 [DFU] gatt.setCharacteristicNotification(8ec90003-f315-4f60-9fb8-838830daea50, true) D 12:21:58.346 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00) I 12:21:58.416 [DFU] Data written to descr.8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 02-00 V 12:21:58.416 [DFU] Notifications enabled for 8ec90003-f315-4f60-9fb8-838830daea50 A 12:21:58.417 [DFU] Indications enabled D 12:21:58.417 [DFU] wait(1000) V 12:21:59.454 [DFU] Writing to characteristic 8ec90003-f315-4f60-9fb8-838830daea50 D 12:21:59.455 [DFU] gatt.writeCharacteristic(8ec90003-f315-4f60-9fb8-838830daea50) A 12:21:59.545 [DFU] Enter bootloader sent (Op Code = 1) I 12:21:59.545 [DFU] Notification received from 8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 20-01-01 A 12:21:59.545 [DFU] Response received (Op Code = 1, Status = 1) I 12:22:04.605 [DFU] Disconnected by the remote device D 12:22:04.607 [DFU] gatt.refresh() (hidden) D 12:22:04.612 [DFU] gatt.close() D 12:22:04.616 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED D 12:22:04.653 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED V 12:22:04.653 [DFU] Scanning for the DFU Bootloader... I 12:22:06.623 [DFU] DFU Bootloader found with address D3:CD:8A:FD:E1:51 V 12:22:06.639 [DFU] DFU service started I 12:22:06.639 [DFU] Firmware file opened successfully D 12:22:06.640 [DFU] wait(1000) D 12:22:07.658 [DFU] wait(1000) V 12:22:08.642 [DFU] Connecting to DFU target... D 12:22:08.684 [DFU] gatt = device.connectGatt(autoConnect = false) D 12:22:09.808 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED D 12:22:09.810 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED I 12:22:09.810 [DFU] Connected to D3:CD:8A:FD:E1:51 V 12:22:09.813 [DFU] Discovering services... D 12:22:09.814 [DFU] gatt.discoverServices() I 12:22:10.413 [DFU] Services discovered D 12:22:10.448 [DFU] wait(1000) W 12:22:11.437 [DFU] Application with buttonless update found V 12:22:11.437 [DFU] Jumping to the DFU Bootloader... V 12:22:11.437 [DFU] Enabling indications for 8ec90003-f315-4f60-9fb8-838830daea50 D 12:22:11.438 [DFU] gatt.setCharacteristicNotification(8ec90003-f315-4f60-9fb8-838830daea50, true) D 12:22:11.439 [DFU] gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x02-00) I 12:22:11.515 [DFU] Data written to descr.8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 02-00 V 12:22:11.515 [DFU] Notifications enabled for 8ec90003-f315-4f60-9fb8-838830daea50 A 12:22:11.515 [DFU] Indications enabled D 12:22:11.516 [DFU] wait(1000) V 12:22:12.565 [DFU] Writing to characteristic 8ec90003-f315-4f60-9fb8-838830daea50 D 12:22:12.565 [DFU] gatt.writeCharacteristic(8ec90003-f315-4f60-9fb8-838830daea50) A 12:22:12.592 [DFU] Enter bootloader sent (Op Code = 1) I 12:22:12.592 [DFU] Notification received from 8ec90003-f315-4f60-9fb8-838830daea50, value (0x): 20-01-01 A 12:22:12.592 [DFU] Response received (Op Code = 1, Status = 1) I 12:22:17.667 [DFU] Disconnected by the remote device D 12:22:17.670 [DFU] gatt.refresh() (hidden) D 12:22:17.672 [DFU] gatt.close() D 12:22:17.683 [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED D 12:22:17.718 [DFU] [Broadcast] Action received: android.bluetooth.device.action.ACL_DISCONNECTED V 12:22:17.718 [DFU] Scanning for the DFU Bootloader... I 12:22:22.733 [DFU] DFU Bootloader not found. Trying the same address... V 12:22:22.765 [DFU] DFU service started I 12:22:22.765 [DFU] Firmware file opened successfully D 12:22:22.765 [DFU] wait(1000) D 12:22:23.770 [DFU] wait(1000) V 12:22:24.797 [DFU] Connecting to DFU target... D 12:22:24.799 [DFU] gatt = device.connectGatt(autoConnect = false) E 12:22:25.984 [DFU] Error 133: Connection timeout D 12:22:25.987 [DFU] gatt.refresh() (hidden) D 12:22:25.991 [DFU] gatt.close() D 12:22:26.001 [DFU] wait(600) D 12:22:26.604 gatt.close() D 12:22:26.612 wait(200) V 12:22:26.822 Connecting to D3:CD:8A:FD:E1:51... D 12:22:26.822 gatt = device.connectGatt(autoConnect = false, TRANSPORT_LE, preferred PHY = LE 1M) D 12:22:27.506 [Broadcast] Action received: android.bluetooth.device.action.ACL_CONNECTED D 12:22:27.534 [Callback] Connection state changed with status: 0 and new state: CONNECTED (2) I 12:22:27.534 Connected to D3:CD:8A:FD:E1:51 V 12:22:27.566 Discovering services... D 12:22:27.566 gatt.discoverServices() I 12:22:27.896 Connection parameters updated (interval: 7.5ms, latency: 0, timeout: 5000ms) D 12:22:28.102 [Callback] Services discovered with status: 0 I 12:22:28.102 Services discovered V 12:22:28.122 Generic Access (0x1800) - Device Name [R W] (0x2A00): - Appearance [R] (0x2A01) - Peripheral Preferred Connection Parameters [R] (0x2A04) - Central Address Resolution [R] (0x2AA6) Generic Attribute (0x1801) - Service Changed [I] (0x2::q!iguration (0x2902) Secure DFU Service (0xFE59) - Buttonless DFU [I W] (8ec90003-f315-4f60-9fb8-838830daea50) Client Characteristic Configuration (0x2902) D 12:22:28.122 gatt.setCharacteristicNotification(00002a05-0000-1000-8000-00805f9b34fb, true) I 12:22:28.162 Connection parameters updated (interval: 45.0ms, latency: 0, timeout: 5000ms) I 12:22:32.624 Connection parameters updated (interval: 195.0ms, latency: 0, timeout: 4000ms)