[REQUEST] Mod BIOS for Sony Vaio SVE1712Z1EB

hi there im trying to mod this bios but i cant, all changes revert to original when i flash it . i use h20exe to make the changes on original bios i also try with dump file giving me error 28 and also try change ini file with hxd all with no success . i know very little about modding, code etc. can anyone help or to this for me?

EDIT by Fernando: Thread title shortened