Krasnowski

Hi I've got a audio a4 b8 and I recently tried to update the software and it didn't work now the unit has crashed and is stuck on the update menu and I can't do anything, the unit always stays on even if the car is off. I tried to restart the unit and it didn't do anything also cleared any error codes with an odb11 and nothing still the same issue and got the error code of 150 on the screen. Is there anything I can try that isn't buying a new unit?