To force a restart on your Huawei press and hold the power button (or unlock button) for at least 8 seconds until the huawei-p30-pro or Android logo appears on the screen and release the button while it turns on again. If the device still does not respond and you cannot restart it, it is possible that it is low on enough battery, in that case
On your iPhone, go to ‘Settings’. Select "Touch" from the ‘Accessibility’ settings. At the top of the screen, go to ‘Assistive Touch’ and turn it on. On the screen, you'll notice a floating button. Now it's up to you to select how the restart shortcut should work. Select ‘Customize Top Level Menu’ to add it to the shortcut menu.

Check out how to force restart Android 9.0 Pie. As a result your HUAWEI Mate 20 Pro should reboot and start running again. Click here to find out more about soft reset operation. How to soft reset HUAWEI Mate 20 Pro? Hold down the Power button for a short while. Then from the menu choose Power Off and tap OK. After that wait for a short while.

This video tutorial is all about How to Restart/Switch off any Android Smartphones without pressing physical Power button .-----

The ambient temperature is too low: Prolonged use in extremely low ambient temperatures will trigger your phone's low temperature protection mechanism, causing your phone to power off or restart itself. Abnormally low ambient temperatures can also decrease the chemical activity of the battery and reduce the battery lifespan.

Step 2: Once the device is turned OFF, you have to long-press the "Power" + "Volume Up" keys simultaneously for a couple of seconds. Step 3: After few seconds, the Android logo will appear on your screen. Step 4: Now, use the "Power" button to enter into Recovery Mode. Step 5: Simply use the "Volume Up" and "Volume Down" buttons to navigate and
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how to restart huawei mate 20 pro without power button