[Q] Can I Custom ROMS Which is for Unlocked on T-Mobile Version? topic

I am gonna buy a T-Mobile HTC One M8 from a friend. I want to use custom ROMs which is for Unlocked version. Is it possible or not?

Actually I want to use ROMs at One (M8) Android Development section. What I have to do that? I always used unlocked Samsung phones and don't know anything about this.

If you help till tomorrow, it's gonna be awesome!