Everything on the newly bought schoolbag Lang's early education machine is gone, and the video songs are gone. What happened?
I. Cause analysis: 1, battery damage. 2. System failure. 3. Charger causes or poor contact. Second, the solution: 1, change another charger, or try the data cable, or clean the charging port. 2. Turn on the machine and enter recovery mode. Select advancsd advanced mode and wipe the battery to remove battery traces.