NRF52DK (PCA10040) problems after updating JLink firmware

[Ros]

Hi,

I updated Segger Embedded Studio to the latest version, 4.50, after that it asked me to update JLINKv6.62a firmware update, but there after I had problems with the board, like SES hangs while debugging, USB to UART is too slow or not responding properly, and JLINK drive (usually pop-up when connecting to PC) disappeared. So tried to enter in the boot-loader mode by pressing down the boot SW and drag and drop firmware found in the following post

https://devzone.nordicsemi.com/f/nordic-q-a/41131/recover-nrf52dk-bootloader

Now it seems OK, except each time SES asking for firmware update. How can I properly update the firmware or should I need to go back to SES ver 4.30b (which was the previous SES)? Where can I find the latest nrf52dk boot-loader?

[Martin Lesund]

Hi Ras,
I will try to reproduce this issue.
I would recommend you to downgrade to a stable SES + Jlink version.

[Ros]

Thanks for the reply, meantime can you suggest where I can find the latest boot-loader?

[Martin Lesund]

Check out step 4 in this thread.