@viv @lifning second-hand AT&T HTC One (M7, the original model)

last official AT&T rom was apparently 5.0 marshmallow, not good

XDA and such have 7.0/nougat roms that apparently work well. i'm a little skeptical since it only has 2GB RAM but who can say?

my first android device was the (awful imo) viewsonic g tablet, which was famous for shipping with an awful 2.2 OS that was easily replaced by custom roms, 2.3, 3.0, etc. but i remember trying those fancy new roms... they went up to honeycomb i think, which seemed very cutting edge -- and they were unusable on the hardware despite the devs and forum die-hards seeming OK w/ 'em. made me forever skeptical.