nRF52840 dev board not detecting

[Rajneesh]

Hello Nordic team

Unfortunately my board not detecting via USB and serial port after putting device in "BOOTLOADER" mode by pressing button-4 + reset while power cycling.

If I am again pressing button-4 + reset while power cycling device enter in bootloader mode but if I am starting device in normal way it doesn't show in nRFGo studio and also power LED doesn't turn on on Dev board.

I read many post related to this problem and I think I have to drag and drop J-link file (reprogram board). If so, where I can file the file to reprogram the board?

Or do I need to do something different to recover nRF52840 dev board?

Kindly help me, I am stuck in development until my board not recover.

Thanks

Raj

[Rajneesh]

Problem solved by searching many threads.

Below are some steps to recover nRF52840 board:

1. Press  button-4 + reset while power cycling. As soon as bootloader window pop-up download bin file from below link. Also I attached screenshot for reference.

https://www.nordicsemi.com/Software-and-Tools/Development-Kits/nRF52840-DK/Download#infotabs

2, After download drag and drop bin file in pop-up window and immediately you can see power led start fast blinking. Then start device again by power switch and open nRFGoStudio and now you can see board detected. If it ask to update firmware then click yes and upgrade the firmware.

I recovered my board by following above steps. I am not sure this is right things to recover the board. So, please follow the steps be careful until Nordic can not confirm. I just shared the info to save someone time.

Thanks

Raj

[cBiscuitSurprise]

This saved me with nrf52833dk as well! Thank you!

(Note for others: it took a minute for my PC to show the new drive after the reset in step 1 -- initially I was power cycling too fast and wasn't allowing enough time for it to show up)