Can not reprogram board after attempting to use DFU

[BigMike]

I was attempting to implement the secure bootloader example on my custom board (nrf52832) and it failed, so I have been trying to reprogram the board with our normal application using j-link and SES ver 5.42b. It fails when it attempts to flash the softdevice. I get the same error if I try to use nrfjprog. I have tried using the recover command in nrfjprog along with just trying to program the software but I get a write verify failed. At this point I have run out of things to try.

[Albrecht Markus Schellenberger]

Hello Mike,

Due to public holidays in Norway, we are short on staff at the moment. I might need some time to analyse your case, but I will come back to you as soon as possible.

I apologise for any inconvenience caused.

Regards,

Markus

[Albrecht Markus Schellenberger]

Hello Mike,

again, my apologies for the late reply.

I’m actually a little surprised that you are not able to reprogram your board, because that should work anyway.

One thing you could try though is to reduce the clock speed and run the recover command again.

 -c  --clockspeed <speed>    Sets the debugger SWD clock speed in kHz                                                                     │
                             resolution for the operation. The valid clockspeed                                                           │
                             arguments go from 125 kHz to 50000 kHz. If given                                                             │
                             clockspeed is above the maxiumum clockspeed                                                                  │
                             supported by the emulator, its maximum will be                                                               │
                             used instead. If --clockspeed option is not given,                                                           │
                             the default is taken from nrfjprog.ini. Must be                                                              │
                             combined with another command.  

I hope this will help you!

Regards,

Markus

[BigMike]

Hello Marcus,

I have tried your suggestion but still no luck... but let me share some more insight. It seems that I am able to reprogram the main section of the flash where the application code resides but I get an error when I try to flash the softdevice area even though I erase all the chip's flash area. I have tried using nrfjprog and SES IDe commands. Any suggestions

[Albrecht Markus Schellenberger]

Hello Mike,

normally, an --eraseall / --recover should erase all memory areas. What kind of error do you get during flashing of the SoftDevice area?

How old is the board you are using? Does your applications perform many read/write operations normally?

What version of nrfjprog are you using?

Regards,

Markus

[BigMike]

Hello Marcus,

Sorry I didn't see your response till today...

1. How old is the board - My custom board is fairly new (less than 3 weeks old)

2. Does my application perform many read/writes operations normally - No we don't store much data and most of the reading or writing is uploading new code for debugging

3. What version of nrfjprog -  nrfjprog version: 10.3.0 JLinkARM.dll version: 6.70g