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Unable to connect to nRF52840 on custom board over SWD. "No idcode detected:

Hi, I have a custom board with an nrf52840 onboard I was able to program the nrf52, but then I executed:

% nrfjprog --eraseall

and, 

% nrfjprog --pinreset

and the JLink can no longer communicate with the board.  I get a "No idcode detected" on SES.  I have also tried nrfjprog --recover and it was not successful.  I thought it may be a bad board, but I now have two boards in the same state.

% nrfjprog --family NRF52 --recover
ERROR: JLinkARM DLL reported an error. Try again. If error condition
ERROR: persists, run the same command again with argument --log, contact Nordic
ERROR: Semiconductor and provide the generated log.log file to them.

All tools are the latest.

log.log:

2260.log.log

 

Voltage looks good.  Let me know if there is anything else that can help debug.

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