If I'm not wrong, I think "Far Manager + JdFlasher" has support for BROWN firmware. So, you can debrand and patch(unlock) without changing to RED. In order to debrand , you must use a "generic" firmware, for example:
K750_R1DB001_MAIN_EU_1_CL_RED49
K750_R1DB001_FS_EUROPE_1_RED49
K750i_CDA102337_9_R5A_Generic_EUROPE_1 .
Don't worry about your age: if you are posting here, it means you're still young :D