You will need them after the reset.
Ensure your phone has at least 50% battery to prevent it from shutting down mid-process, which could corrupt the system. Method 1: Hard Reset via Recovery Mode (Buttons) How to Hard Reset HUAWEI L21 P9 Lite
A hard reset on the HUAWEI L21 P9 Lite is a powerful tool for solving chronic software problems or preparing the phone for sale. Always back up your data first and know your Google credentials. Once completed, your P9 Lite will feel fresh, responsive, and error-free—just like day one. You will need them after the reset
This is the easiest method if your phone is still responsive and you can unlock it. Always back up your data first and know
This process will permanently erase all data on the device, including photos, apps, and accounts. If your device is protected by Factory Reset Protection (FRP) , you must have your Google account credentials ready to sign in after the reset. Method 1: Recovery Mode (Using Buttons)
Since the P9 Lite runs on Android (likely Android 6.0 Marshmallow upgradable to 7.0 Nougat), it features . This is a security feature designed to prevent thieves from using a stolen phone. If you reset the phone, you will be required to sign in with the Google account previously synced on the device. If you do not know the email or password, you will be locked out. Make sure you know your login details!