nRf52840dk stuck in bootloder mode.

RE: nRf52840dk stuck in bootloder mode.

hika — Mon, 28 Nov 2022 02:51:52 GMT

I connected nRF52840DK to my Raspberry Pi 3 (Raspberry Pi OS 32bit) and recognized it in bootloader mode. And I was able to burn the bootloader without errors.

By the way, the version of the board was 2.0.1.

Thanks for your help in resolving it.

RE: nRf52840dk stuck in bootloder mode.

Sigurd — Fri, 25 Nov 2022 12:34:20 GMT

Hi,

1) If you have an preview development kit, i.e. below version 1.0.0, I suggest purchasing a new one. DK version is printed on a white sticker on the DK.

2) Looks like others that have faced this issue, have been able to use macOS/linux to update, ref. RE: Unable to update Jlink interface firmware on older nRF52832 development kit

RE: nRf52840dk stuck in bootloder mode.

hika — Fri, 25 Nov 2022 01:57:14 GMT

I have been to this page before.
It's on the troubleshooting list.
1. I tried reconnecting repeatedly, but there is no display in the device manager. It never appeared with an unexpected name.
2. The USB cable and port have been changed several times.
3. It is not displayed on another PC as well.
4. If you press the IF BOOT/RESET button while turning the power back on, "BOOTLOADER" is displayed for a moment, but the MCU firmware (v170724) cannot be written even if you drag it. I got a size over warning and it didn't succeed.
5. The voltage of the kit was 3.0V and there was no abnormality.
6. Relatively new with j-link V7.82c.
7. I haven't tried this. Unable to connect with j-link commander.

I installed mbedWinSerial_16466.

RE: nRf52840dk stuck in bootloder mode.

Sigurd — Thu, 24 Nov 2022 09:47:56 GMT

Could you go through this troubleshooting list? :

My nRF52/nRF51 DK kit doesn't work.

RE: nRf52840dk stuck in bootloder mode.

hika — Thu, 24 Nov 2022 08:23:06 GMT

Thank you for your reply

I have already tried other USB ports and USB cables several times, and I don't think there is a cause here.

I don't know where you can check the version of dk boad, but "ATSAM3U2C" is installed in the interface MCU.

PC OS is windows 10 pro 64bit

RE: nRf52840dk stuck in bootloder mode.

Sigurd — Wed, 23 Nov 2022 15:53:00 GMT

Hi,

Could you try a different USB port?

What DK versions is this?

What computer OS are you using?