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?

[Bhuvanchandra DV]

Hi Aryan, It took a while for us to get the J-Link EDU. Tried connecting the nRF51 DK board to external J-Link EDU via J3 on board, erased and flashed the firmware 'J-Link OB-SAM3U128-V2-NordicSemi_150311.bin'. Flashing process seems successful, but after resetting, still the nRF51 DK OB J-Link is not getting detected! Flashing procedure followed: http://pastebin.com/y8JQeQqC Can you check the above procedure and tell me if any thing went wrong! If possible can you provide the steps/references for re-flashing the firmware to un-brick the nRF51 DK OB J-Link using external J-Link EDU. Please let me know if you need any info from my side.

-- Bhuvan

[Susheel Nuguru]

Your JLink uses Cortex M3 and it seems to be assesible, your nRF chip is cortex M0 and this is what it seems bricked. use nrfjporg download latest SDK developer.nordicsemi.com/.../ uzip it and install nRF_mdk_7_2_1.msi then from command prompt, say nrfjprog --recover. If this does not work then your device is bricked for good.

[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

[Susheel Nuguru]

your steps to download the firmware seems to be OK, can you try re-installing the tool www.segger.com/jlink-software.html. This helped me once to detect anamoly on Segger chip and it reflashed onboard firware automatically.

[Bhuvanchandra DV]

OK, i will give a try any let you know the status.

Thanks!