After problems with the programmer I have successfully flashed simple custom board with ACN52840 module, but the unit does not resetting after flashing using J-Link Pro. Starting after grounding reset pin or "nrfjprog --reset".
Terminal show:
Enabling pin reset.
Applying pin reset.
Simple board configuration:
3xVCC shorted
3xGND shorted
470uF capacitor across supply
Reset pulled-up by 10kohm.
Jlink pro connected to SWDIO, SWDCLK, GND, Vcc.
Another maybe related is that there is nothing on RTT viewer, on the nrf52840DK RTT and reset after programing is working as it should.