The device communicates okay with JLINK commander v7.00a although at the beginning it always says "Connecting to J-Link via USB...Out of sync , resynchronizing...
J-Link communication resynchronized" before moving on. Not sure if this is related..
nRF connect is version 3.61 Below is a copy of the log from nRF connect programmer:
2021-05-05T15:01:59.380Z INFO Application data folder: C:\Users\tlechman\AppData\Roaming\nrfconnect\pc-nrfconnect-programmer
2021-05-05T15:01:59.452Z DEBUG App pc-nrfconnect-programmer v1.4.8 official
2021-05-05T15:01:59.452Z DEBUG App path: C:\Users\tlechman\.nrfconnect-apps\node_modules\pc-nrfconnect-programmer
2021-05-05T15:01:59.452Z DEBUG nRFConnect 3.6.1 is supported by the app (^3.6.0)
2021-05-05T15:01:59.452Z DEBUG nRFConnect path: C:\Users\tlechman\AppData\Local\Programs\nrfconnect\resources\app.asar
2021-05-05T15:01:59.452Z DEBUG HomeDir: C:\Users\tlechman
2021-05-05T15:01:59.452Z DEBUG TmpDir: C:\Users\tlechman\AppData\Local\Temp
2021-05-05T15:01:59.488Z INFO Using nrfjprog library 10.12.1, pc-nrfjprog-js 1.7.6
2021-05-05T15:02:02.187Z INFO Using nrfjprog to communicate with target
2021-05-05T15:02:13.192Z ERROR Error while probing devices: Error occured when get serial numbers. Errorcode: Could not execute the function due to too many calls in line (0xe)
2021-05-05T15:02:13.193Z INFO Target device closed.
2021-05-05T15:03:23.856Z INFO Using J-Link Software version 7.0
2021-05-05T15:04:35.522Z INFO Segger serial: 601003234
2021-05-05T15:04:35.523Z INFO Segger speed: 2000 kHz
2021-05-05T15:04:35.523Z INFO Segger version: J-Link V11 compiled Apr 13 2021 17:20:05
2021-05-05T15:04:35.524Z INFO Core probed: 601003234
2021-05-05T15:04:35.524Z INFO Core RAM: 256KiB
2021-05-05T15:04:35.524Z INFO Core ROM: 1024KiB in pages of 4KiB
2021-05-05T15:05:09.335Z INFO Model: NRF52840_xxAA_REV2.
2021-05-05T15:06:26.140Z INFO Core0: Reading device non-volatile memory. This may take a few seconds.
2021-05-05T15:07:23.448Z INFO Core0: UICR has been read. Click read button to read full non-volatile memory.