HUAWEI P9 HARD RESET by Secret Code
How to Hard Reset HUAWEI L21 P9 Lite - Remove Screen Lock
How to Wipe All Data HUAWEI L21 P9 Lite - Factory Reset in HUAWEI
How to Hard Reset HUAWEI Mate 9 - Restore Andorid / Delete Data
Hard Reset HUAWEI Mate 9 - Bypass Screen Lock / Delete Data
How to Restore HUAWEI Mate 9 - Reset Code / Hard Reset / Format
Hard Reset will erase all of your data
All described operations you are doing at your own risk.