I bought a Samsung Galaxy S6 Edge from South Korea, so it's model is SM-G925K (K for Korea). I live in UK and I know UK model number is F, because I own a UK Samsung Galaxy S5 (SM-G900F). I want to flash my Samsung Galaxy S6 Edge with UK firmware. I've tried many from sammobile: 5.0.2 Vodafone brand 5.1.1 BTU (unbranded) but they all came back with NAND errors and fail. The only firmware that worked was flashing it back to Korea 6.0.1. Q. Could it have failed because I was trying to flash a 5.x.x firmware but it only accepts 6.x.x? Q. Is it possible to do something to get it to flash a UK firmware on a South Korea Samsung phone?