nRF5340DK IMCU Bricked

[AnujPathak]

Hi All,

I have a 5340dk and it got bricked for no reason, last night I was able to flash and debug my program. But when I tried this morning, device is behaving unexpectedly. 
LED 5 either turns on and goes off quickly, or blink for random duration and then goes off.
when it does blink I could get jlink detected popup once in windows. and then it goes off.
Sometime of led goes off after some random duration it could blink once too.

Hardware information:
PCA10095
2.0.0
2022.10

I have not modified any SB all switched are in default state.
I have also measure voltages on VDD_nRF which is 3.0v.

Regards
Anuj

[Kazi Afroza Sultana]

Hello,

You can try to reflash the nRF5340 program by ''tag connect'' and another debugger.

Tag Connect:

The binary file can be found in C:\Program Files (x86)\SEGGER\JLink\Firmwares (JLink_OB_nRF5340_NordicSemi.bin).

The one end of the tag connect will be connected on the nRF5340-DK. And the other end of the cable, needs to be connected to a different debugger. 

[AnujPathak]

I do not have tag connect but from nrf5340dk's schematic, it seems there are touch points (SWDIO/CLK) to enable flashing of IMCU too.
I'll try and revert back

Thanks

[Kazi Afroza Sultana]

Ok. Good Luck.