Issue: nRF Connect Android App (v4.29.1) Completes DFU, but Firmware is Not Updated on nRF52840 (MCUboot)

RE: Issue: nRF Connect Android App (v4.29.1) Completes DFU, but Firmware is Not Updated on nRF52840 (MCUboot)

Hung Bui — Thu, 06 Mar 2025 12:54:38 GMT

Hi Sai,
If your device do have logging, we will need to look into the log on the device as well.

Have you tried to update the firmware to a simple firmware for example blinking or other BLE application ?
Have you tried confirm only option ?
How long did it take from the time you finish the image sending until you can reconnect ?
Please also try to enable option "Erase application setting" I suspect that there could be a chance the new application crashed/reset and it get reverted back to the original image. Remove the original application data could be a good test, just in case the new application doesn't work with the original application data.

So it's very important to get the log or test updating a very simple application.

RE: Issue: nRF Connect Android App (v4.29.1) Completes DFU, but Firmware is Not Updated on nRF52840 (MCUboot)

Sai — Wed, 05 Mar 2025 14:22:19 GMT

Hi Hung Bui,

The image was set in both Test and Confirm mode. And here are the app settings for Connectivity, MCU manager and, DFU

Here is the nRF Connect App log devzone.nordicsemi.com/.../Log-2025_2D00_03_2D00_05-14_5F00_49_5F00_24.txt.

In the log, line 41 shows the firmware version before the DFU update, and line 188 shows the firmware version after the update. As you can see, the upload process was successful; however, the firmware version remained unchanged, indicating that the update did not take effect.

Let me know if you need any additional details or further analysis.

Thanks and regards, Sai

RE: Issue: nRF Connect Android App (v4.29.1) Completes DFU, but Firmware is Not Updated on nRF52840 (MCUboot)

Hung Bui — Wed, 05 Mar 2025 12:09:21 GMT

Hi Sai,

We would need to have more debug information. Do you have any logging ? Both on the nRF52 and on the phone ?
I was suspecting that the image was in Test only mode and didn't get confirmed so it get reverted back. But you mentioned that the new image didn't run even for once. So it could be something else.

Could you try to add DFU to a very simple application for example peripheral_lbs and test if you can update it ? (try to make simple modification for example change advertising name to create the DFU image)
If you can't please send us your project files and send us the DFU .zip file so we can test here.