Press and hold the "Power" button to evoke the power off screen on your Huawei phone. Then, tap "Power off" to turn off the phone firstly. Once the screen turns black, you need to long-press the "Power" and "Volume Up" buttons at the same time till the Recovery Mode screen appears. Use the "Volume Up" or "Volume Down" key to select the "Wipe
You can finish Huawei Mate 20 Pro hard reset process via recovery mode by following the below steps. Be sure that your device has at least %50 charge life. Power off your device and wait a few seconds. Press and hold Volume Up + Power buttons together until recovery mode screen appears. (These button combinations can change on different modals.) Ensure your Huawei Mate 20 Pro has a sufficient amount of battery power, if you try to reboot your phone with a critical amount of charge it may not turn on after the reboot. System updates can bring improvements that could fix your issue.