Sunstech uSun200 - Performing Factory Data Reset

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2-Push “VOL –“ key and select “wipe data / factory reset” then
press “VOL +” .
3- Select “ Yes delete all user data ” with the “VOL–“ Key and then
press
“VOL +” to select.
Android-appeared.
4- When it finishes select “reboot system now” press the “VOL
+ "button and the unit will re-start itself. (this process may last for a
few minutes)