How to factory reset KOOBEE S509? How to wipe all data in KOOBEE S509? How to bypass screen lock in KOOBEE S509? How to restore defaults in KOOBEE S509?
The following tutorial shows all method of master reset KOOBEE S509. Check out how to accomplish hard reset by hardware keys and Android 6.0 Marshmallow settings. As a result your KOOBEE S509 will be as new and your MediaTek MT6737M core will run faster.
Hard Reset will erase all of your data
All described operations you are doing at your own risk.