I would look for a little hole about the size of a pen nib. it would be the reset button.
if that does not work then i would disconnect your cars battery and then remove your radio fuse for roughly 5-10 min ( to allow any residual currant to drain) then refit both. that should reset your radio system. It is EXTREAMLY rare for serious damage to be done to a car radio just from pushing buttons.
I hope i have managed to help you with your problem.
cheers
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