nRF52840-DK Jlink nRF flash issue

[daweiz]

After nRF52840-DK board flash with Jlink (commands are below) LED is off and no COM port detection

1. First attempt flash:

nrfjprog --family nrf52 --program gemini-pulsar-host.hex --sectorerase --reset
[error] [ nRF52] - Access protection is enabled, can't read device version.
ERROR: The operation attempted is unavailable due to readback protection in
ERROR: your device. Please use --recover to unlock the device.
NOTE: For additional output, try running again with logging enabled (--log).
NOTE: Any generated log error messages will be displayed.

2. Run --recover as recommended to disable APP protect:

nrfjprog --family nrf52 --recover --log
Recovering device. This operation might take 30s.
Erasing user code and UICR flash areas.
Writing image to disable ap protect.

3. Eraseall:

nrfjprog --family nrf52 --eraseall --log
Erasing user available code and UICR flash areas.
Applying system reset.

4.flash FW via Jlink to the DK board debug-in 10-pin port:

nrfjprog --family nrf52 --program gemini-pulsar-host.hex --sectorerase --reset
[ #################### ] 3.891s | Erase file - Done erasing
[ #################### ] 0.812s | Program file - Done programming
WARNING: A programming operation has been performed without --verify.
WARNING: Programming can fail without error.
Applying system reset.
Run.

5. cant detect nRD52DK board in COM port, no LED light anymore.

Dawei

[Priyanka]

Hi,

Which is your DK revision? Also, which fw are you trying? Does this happen with any fw?

What is your JLink version?

Best Regards,

Priyanka

[daweiz]

nRF52840-DK

Jlink Ultra+

The FW is internal designed FW which works for nRF52832 chip with the 10pin debug-in port

Dawei

[Priyanka]

Hi Dawei,

Could you try running the --recover again and flash a different fw?

Also, please restart the DK with a power cycle. You can use the following commands:

nrfjprog --recover
nrfjprog --program <path/file.hex> --verify --chiperase
nrfjprog -r

-Priyanka