PiPO U3 - Manual (Page 21)

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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.
3. Big noise
Check if there is dust in the earphone or speaker. Check if the file is
broken.
4. Screen drift or unresponsive screen
To pin the reset button to reset your tablet and power it on again.
5. Application not workable
Possible reasons may be that this app is not compatible with your OS or
the downloaded .apk file is broken so you may need to download a full
version.
6. How delete a Google account?
If an account is added, the account is shown in “Accounts & sync” of
“Settings”, where you may also add another account. To delete an
undesired account, go to “Settings” → “Privacy settings” → “Factory
data reset”. Your tablet’s internal storage, downloaded apps, etc. will
also be deleted, except the info in your flash memory. Be careful before
you carry out this operation.