how to determine nRF51822 laser mark

Question

Recently i have bought 4 nRF51822 custom board and unable to program it.
The laser mark of the nRF51822 for custom board is
N51822
QFAAC0
1308AE 
 I failed to program with the firmware that function properly on the nRF51822 Dev Kit. Keil uVision shown success program message but nRF51822 custom board did not shown any respond. All register's value is 0xFFFFFFFF when using Keil uVision debug mode.
The laser mark of the nRF51822 for nRF51822 Dev Kit is
N51822
QFAAC0
1309AF 
 P/S: nRF51822 custom board's agent did not reply my email. So, i have to try to fix it myself.:(

Ole Morten · Accepted Answer

There is no difference between chips with the markings you've mentioned here, and both the "nrf51822_xxaa" and the "nrf51822_xxaa_s110" targets can be used on this chip. When to use which of these depends on whether or not you have the softdevice programmed or not. If you have the S110 softdevice programmed, it will occupy the lower part of the flash, and the target options in Keil must therefore be slightly different to avoid Keil trying to overwrite it. This is the difference between these two targets. 
 This means that if you have the softdevice programmed, you have to select the _s110 target while if you don't, you must select the target without the prefix.