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I have same issue deleted USER folder content except SYSTEM folder. I have update the firmware and it created the file structure again and unit back to operational. AVIC-X9310BT

I have AVIC-X9310BT unit in subaru BRz. While trying to sofmod parking brake bypass accidently delete all the files under USER folder. can someone please help give direction to fix the issue or if someone has USER folder backup from same unit. Pls Pls share..... Unit is bricked right now...