nRF51dk -> problem with programming external nrf51822 board (from china)

[Klemen]

Hi.

So my problem is, that i cannot successfully program external board with preprogrammed nrf51822 chip in the board.. This board is from china.. its an ibeacon.. If i unsolder the chinese chip from the board and replace it with the chip from the nrf51 dk dev board (nrf51422) everything works like it should.. I can easy program the external board through P20 connector..

Is it a problem with nrf51822 <> nrf51422?? the same program should work on both chips.?. The program is very small - blinky. Or is there a problem, becouse chip from the chinese board is preprogramed and is locked?

Thanks, Klemen

[Klemen]

Chip markings: N51822 QFAAH0 1524FY

I tried the upper method on the chinese and a new chip.. The new chip worked normal, the chinese returned error -> No device detected (int the pictures)

I also checked JLinkARM.dll installation path (in register) and in it is on the correct path

recover.png Studio.png StudioNewSuccess.png

EDIT: Solved.. I had to plug-in and out the nrf51DK board from the USB port (several times..).. also had to change the usb post.. ?? Now 80% of the time it works, 20% not works.. ?