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

[Einar Thorsrud]

If the chip is locked, you can use nrfjprog --recover to erase the flash and disable protection. The only difference between nrf51822 and nrf51422 is that only nrf51422 support ANT, so this is not related.

If it does not help it would be interesting if you could provide details on how it fails when you try to program the chip, and the markings on the chip in order to know which variant it is.