nrf51 DK board not detected !

[Bhuvanchandra DV]

Hi

Recently we bought NRF51 DK board. Initially when i connect the nrf51 DK board to PC via USB it mounts JLINK driver and on IF/BOOT button it mounts BOOTLOADER drive. Updated the bootloader firmware 'ble_default_bootloader_app.hex' (initial FOTA image: developer.mbed.org/.../ to BOOTLOADER drive. After this i was not able to see the LD5 led blinking/on, and not able to detect the nrf51 DK board as USB device/MSD, tested with nrfGo studio and with JLink tools also. How to recover the bootloader and detect the nrf51 DK board?

[Susheel Nuguru]

I think you flashed the wrong bootloader, try to recover your device using

nrfjprog --recover option

or Run JLink Commander ( JLink.exe ) and in it's command window give following commands; si 1 r h w4 4001e504 2 w4 4001e50C 1 w4 4001e514 1 r That reset's whole flash

[Bhuvanchandra DV]

Hi Aryan,

My problem is with bricked on board J-Link not the on board nrf SoC. I was asking about the procedure for unbricking the on board J-Link. If the SoC on board got bricked i think we can some how manage to un brick it using the on board J-Link.(assumingzOB J-Link is working)

The question is about unbricking the on board J-Link! I was trying to un-brick the bricked OB J-Link available on nRF51 DK board using an external J-Link module, I'm not talking about the nrf51422 SoC!. Can you verify the procedure i followed for unbricking the onboard J-Link

FYI: I was able to program the on board nrf51422 SoC using the external J-Link EDU via P18 DEBUG_IN port. No issues with on board nrf SoC.

Best regards, Bhuvan