QUERY: flashing another country firmware - possible?

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....

QUERY: flashing another country firmware - possible?

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