I told you this as an answer to your previous question. It has nothing to do with the nRF51 development kit the ARM Cortex processor in the nRF series is little endian. It's documented in the nRF series manual, even if it weren't, although ARM allows for big or little endian, I can't think of one I've seen which is big, and even if you weren't absolutely sure from the documentation and the usual practice, there's a register you can read in the processor which tells you what the endianess is.
You appear to still be trying to solve a problem you don't have.
