PiPO M9 pro OTA - Manual (Page 43)

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finishing USB installing, go back to upgrading mode.
Note
If your PC is with Win7 or Vista system, it will not pop out the guide leading
you to install the driver, you get to install the driver in ―My Computer‖.
1. Right click ―My Computer‖, select ―Device Manager‖
2. There will be an ―Unknown Device‖ with an exclamation mark appears
3. Right click the ―Unknown Device‖, select ―renew driver software‖
4. Load the USB driver included in the ―RK batch tool‖ to install the USB driver.
Note: Do not turn on ―USB Debugging‖ in the setting when upgrading
firmware.
5. When you finish the driver installation, you can come back to upgrading
procedures.
Troubleshooting
1. Can not turn on the tablet
Check the tablet‘s power level; please charge it before starting it. In case your
tablet still cannot be turned on, you may try to reset it
2. No sound from earphone
Check if volume is set to ‗0‘. Or earphone may be broken, please change for
another one.