Bootloader-Only update over BLE DFU

[jmag999]

I am running SDK 14.2.0 and trying to update only the bootloader.  Very minor changes were made, resulting in no size increase.

I ran nrfutil (V3.4.0) using the following command:

nrfutil pkg generate --hw-version 52 --bootloader-version 3 --bootloader Bootloader.hex --sd-req 0x9d --key-file Signing\private.key Bootloader-Pack
age.zip

When I try to update, I get a quick error just after the dfu starts:

DFU failed with error: When writing 'EXECUTE' command to Control Point Characteristic of DFU Target: Operation code 4 (EXECUTE) failed on DFU Target.  Result code 4 (INSUFFICIENT_RESOURCES).

I think this means there is not enough room to perform the update, but the bootloader is within the range allocated and merges/works fine when loaded directly using a j-link.

Any ideas?

[Edvin]

Hello,

I am not quite sure about this one. I thought the bootloader would delete the application if it was not space for dual banking.

What SDK is your original bootloader based on?

Is it possible to reproduce this on an nRF52DK? Is it possible to send the original bootloader project, and also the application that is on the chip? At least the .hex file, so that I can try to reproduce it?

 

I also found another case with someone else facing the same issue. Do you use the debug bootloader project? Do you have dual banking enabled (in sdk_config.h on the bootloader project)? 

 

Best regards,

Edvin