Using pins D9 & D10 on the MDBT42Q

so are you actually calling the SETNFC() method? you might also try setting some global variable inside the uicr flashing method sent to NRF.restart to verify it is really called.
like var done=0 and adding done=1 after poke32(0x4001e504, 0);while(!peek32(0x4001e400));