Just came across this looking for other things online. I believe this is an official release from Baofeng to open up the radio from 480mhz to 520mhz. I did this to my UV-5R and UV-5RE without any issues. Make sure you uninstall any previous version and backup your radio data before you go forward with this.
I tested this with receive only frequencies and did not test this keying up the radio past 480mhz.