If you have a screen lock (PIN, pattern, or password), enter it.
The phone will reboot and erase everything. This takes about 2-5 minutes. Use this method if you forgot your screen lock, password, or the phone is stuck on the logo screen. How to Hard Reset HUAWEI L21 P9 Lite
A hard reset will erase ALL data on your phone, including contacts, photos, apps, messages, and accounts. It will return the phone to the exact state it was in when you first bought it. Back up your data before proceeding. If you have a screen lock (PIN, pattern,
Tap Factory data reset .
If your Huawei P9 Lite L21 has a Google account on it, you must know that password after the reset, or the phone will lock itself. This is an anti-theft feature. How to Hard Reset HUAWEI L21 P9 Lite