China Tablet phone storage corrupted ! Cant Access internal storage cant format"Hang"

hi i have cheap china tablet
i dont know what happen
but i cant access internal storage
pc cant recognize mtp or usb
cant access internal storage via pc
cant access internal storage via file manager in android .. its show how much balance mb left but dont open / explore!

Cant install app
cant uninstall app

bonus is that volume buttons are also broken so cant access chiness recovery to format internal storage !
Please help guys .. please help to format internal storage .. i think this will solve my issue !

however device connects via adb to pc & pc recognize adb device so i can do some stuff via adb ???


"Please help !

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