Trebuie sa ii faci soft complet cu aplicatia de fabrica. Aici gasesti softul: nl02.dl.prestigio.com/Service_Files/TabletPC/PMP3870/PMP3870C_20130801_v1.0.14.zip
Si aici gasesti un tutorial facut pe un model asemanator: https://www.youtube.com/watch?v=c24i5uDDkxM