nRF Connect Programmer - Modem DFU failed

[Black_Ice]

Hello,

Just want to ask how to solve this issue? I am using J-Link with updated version. 

I also did 'erase all' before updating the modem and flashing. I succeeded on initial few samples but then suddenly

this error happened. Now I even cannot re-flash those units that were good earlier.  

[Martin Lesund]

Are you using the Debug_out on a nrf91DK to flash the custom board or an external Jlink?
Whats the nrfjprog version you are using?
open cmd and type 'nrfjprog -v'

[Black_Ice]

Yes. Even there's no RTT viewer I still get the error. 

I tried on the different project from other customer using nRF9160 and it works just fine. 

[Martin Lesund]

Black_Ice said:

the different project from other customer using nRF9160 and it works just fine. 

 This issue only happens when you try to update the modem firmware?

Or does it happen when flashing the Application itself?

Are you following the steps mention in this Application Note
"nRF9160 Production Programming": https://infocenter.nordicsemi.com/index.jsp?topic=%2Fnan_041%2FAPP%2Fnan_041%2Fintro.html&cp=13_0

[Black_Ice]

how to know if my device's protection is enabled? These boards were pre-loaded with hex file, I just re-flash them to view public and private key.

[Martin Lesund]

It could be that the application you flashed sets this https://infocenter.nordicsemi.com/index.jsp?topic=%2Fref_at_commands%2FREF%2Fat_commands%2Fmob_termination_ctrl_status%2Fxproddone_set.html&cp=2_1_4_27_0
in the application.

Could you try another jlink or another computer to see if the issue can be there?