What problems can be solved when Renovate and upgrade firmware?

※there is backlight but no any display & sound after power on(blue screen)

※FM displays right, and can be adjusted rightly, but no sound out.

※the move memory disk can be found, but can not save and delete data.

※the character is in reverse the screen.

※backlight keep lighting, can be operated rightly(the time of the backlight can not be set)

※no respond(exclude the loose of battery lid)

※Frequency-Hopping when playing MP3

※display foul-up on the screen(exclude break off & leave out code)

※solve the problems of the existent bug or compatibility.

※amend the way of operation, operate conveniently

※support more formats of music