Secure DFU bootloader: application not starting

[mr91]

Hello,

I have a problem with secure bootloader. what I did:

1. Flash SoftDevice 130 using nRFgo Studio.
2. Compiling \examples\dfu\bootloader_secure\ (i removed the error regarding the key).
3. Flashing the bootloader with Keil (using nrfjprog.exe for flashing).

Unfortunately, the bootloader seems not to run. There is no advertisement "DfuTarg". When I compile the buttonless dfu example and flash it with Keil, there is still no response. So the bootloader does not start the application. There are no debug messages over UART either.

However, when I flash the precompiled debug version (secure_dfu_secure_dfu_ble_s130_pca10028_debug.hex), the bootloader is advertising as "DfuTarg". When I load an application (using Keil or DFU with nrfConnect´), it does not leave the bootloader mode.

Can you tell me whats wrong?

Thank you!

Edit: I use SD130 on nRF51

[Hung Bui]

Hi,

The bootloader was made so that you would need to program the application via DFU bootloader to make it start.

If you don't want to use the DFU bootloader to upload your first application, and prefer to use the programmer instead, you need to alter the bootloader setting in flash to tell the bootloader to start the application. You can generate a bootloader setting hex file then write it to flash to do that. Please have a look here.

[mr91]

Thanks for your reply. In fact it would be great to use DFU to transfer even the first appliation. This is what I did:

1. Erase device
2. Program SD130 using nRFgo Studio
3. Compile the bootloader with my own keyfile (created out of priv.pem)
4. Flashing the bootloader (device is then advertising as "DfuTarg"
5. Compiling my application
6. Copying the generated Hexfile (app.hex) to the nrfutil folder
7. Running nrfutil with: 
nrfutil.exe pkg generate --application app.hex --key-file priv.pem --hw-version 51 --sd-req 0x67,0x80,0x87 --application-version 0x02 output.zip
8. Transfering output.zip to my mobile phone
9. Connecting to "DfuTarg" in nRF Connect app
10. Choosing "DFU" in the upper right corner
11. Choosing the file "output.zip"
12. Progress is displayed as graph
13. After "Disconnecting" is shown in the app, the device is still advertising as "DfuTarg", not running my application

Can you tell me whats wrong?

Edit: Also tried it with nRF Toolbox, same result (progress is completed, still advertising as DfuTarg). Also tried to create a bootloader settings file and merged it with the application, then same process with nrfutil as above. In that case, the bootloader does not accept the file in the first place (no progress is shown in apps, immediate disconnecting after connection is established).

Edit: I performed all above steps with SDK V12.2 (since bootloader was not advertising in 12.1)