Unable to reprogram the nrf52840 chip.

RE: Unable to reprogram the nrf52840 chip.

Håkon Alseth — Tue, 18 Mar 2025 09:05:38 GMT

Hi,

It sounds like the devices are in a assertion loop (reset loop) - could you try to run this routine while power-cycling your board?

Run this as a .bat file:

:loop
nrfjprog --recover -f nrf52
goto loop

Kind regards,

Håkon

RE: Unable to reprogram the nrf52840 chip.

Rahul_Shewani — Mon, 17 Mar 2025 14:44:15 GMT

Hi ,

1. There are 5 boards that have been made as an initial prototype and all 5 have faced this issue.

2. I was able to flash code multiple times on all 5 boards before they unexpectedly started facing issues on refreshing the firmware.The chip still seems to be working as I am able to get logs from PCB's debug port,

RE: Unable to reprogram the nrf52840 chip.

Håkon Alseth — Mon, 17 Mar 2025 12:55:19 GMT

Hi,

Q1: How many boards are behaving like this?

Q2: Has the non-working boards ever been programmed successfully?

Kind regards,

Håkon