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nrf51822 openOCD GDB open debugger

I am able to flash/program nrf51822 with openOCD on Raspberry-pi and STLink-v2

but when I invoke Open On-Chip Debugger on telnet to write on UICR register, it don't give error but when I read it back, i don't see any change in register value.

Open On-Chip Debugger

nrf51822.cpu mww 0x10001088 0x00000101

nrf51822.cpu mdw 0x10001088 0x10001088 ffffffff ....

After that I used nrfjprog on PC, with same board I was able to update UICR register

C:\Users\hh>nrfjprog --memwr 0x10001088 --val 0xFFFFFF11 Parsing parameters. Writing.

C:\Users\hh>nrfjprog --memrd 0x10001088 0x10001088: FFFFFF11 |....|

Does I have missed anything.

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