nrf52 DK keeps resecuring itself

[emlynkz]

Hi,

I have just acquired a new nRF52 DK devkit.

Performing a `nrfjprog --recover` followed by `nrfjprog --eraseall` doesn't work to remove the protection.

I do not flash a new firmware on it. After a power cycle, I need to recover and erase the MCU again to connect to it via RTT.

Any idea how to fix this?

Thanks,

Étienne Machabée
Lynkz Instruments Inc.

[byte]

Hello Étienne,  

This looks very similar to the problem I'm having although I have an nrf5340 project. This started happening to me after I upgraded from nrf connect v2.7.0 to nrf connect v2.9.0. Are you also using nrf connect v2.9.0?

Rob

[emlynkz]

I do not use nRF connect but I use J-Link directly. nRF connect embeds a version of J-Link. Maybe it's that new version that causes this issue.

Étienne

[byte]

You are not using any version of the sdk? Just directly programming it with what then, an example hex file?

Rob

[byte]

Ah, I just realized what you mean. I am not having that same problem. I only get the error after I flash something from v2.9.0