Cannot erase/program custom nRF51 board usign nRF51 DK

[Vlad]

Hello,

I've found a lot of topics about this issue but none resolved my case.

I'm trying to program a custom N51822 board (QF ACA 1) but without success.

These are the connections (I've tested with external supply for the custom board also):

This is the output from JLinkExe:

This is the output from JLinkExe if I reset the board before erasing:

This is the output from nrfproj:

Also in the custom board datasheet, it sais "Connect a 12K ohm resister to GND for flash programming".

The schematic doesn't show any resistor on P20 connector, only on P19. Could that be the problem?

Later EDIT: I tried with 12K ohm resistor, doesn't work ("cannot connect to target" is returned); I attached the log from "nrfproj --recover --log" output.

log.zip

Thank you, Vlad

[Vlad]

Hi Bjorn. I didn't cut anything on the DK board. I managed to program the DK board without the custom board successfully. I tried to program the custom board using a 12 Ohm Resistor on the CLK line, but then, JLink could not connect to the target any more. I didn't tried to program the board using P19 connector, because I don't have the interface (connector). It may be the custom board... hope not :). Thanks