I also got two BF888S radios and a UV-B6 and with the lead and software programs CHIRP, UV-B5 Radio Program Software and HKT-480 Radio Program Software I have reprogrammed them for amateur band and PMR446 however technically they do not comply with PMR446 as they don't have it written on the radio, although in UK is seems a bit vague as to if the power output complies if it is actual against the law? In most of Europe they do not comply as you can remove the aerial, and the PMR446 frequencies in the US are part of the amateur band.
When I tried to reprogram the BF888S with HKT-480 Radio Program Software on switch on they screamed at me, I then tried CHIRP this stopped them screaming but were in Chinese and VOX was on, so then needed to use keys and knobs on radio to return them to English and turn VOX off. It was not plain sailing.
The UV-B6 was easier to program, you could have in theory done it all in radio, however it would have taken for ever, most of my amateur radios have say something like "FCC ID AKH9TU FT-208R" which I assume means OK to use in USA, however that is not written on the cheap radios.