odds are that your friends and yours will be different in some way, either the screen will be different type, or the radio chip different etc etc
basically even if you bought both from tinydeal they could still use different parts as tinydeal buy from many different factories the same looking player and one will be different from another
if you like to experiment then you can try and swap firmwares or try others but chances are it will not work and you will need to recover the player which can be done but is a pain
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