beats studio wireless, everything shutdown, only bluetooth working

my beats studio wireless doesn't work.

i changed the battery and now only Bluetooth is working, the led too and perfectly connect with pc.

furthermore if i plug beats via usb "beats updater" detect the headphones and says battery is 8% (and this is not true) so i can't update firmware too...

the rest is completely shutdown (battery led, speakers, noise cancelling, everything) with audio cord plugged too.

any ideas ??