Yesterday we got the Android 10 update on our HUAWEI P smart 2019 devices, since this we can not remote support with QuickSupport, after connecting to the device only a Blue-Hand apears and the message "Das Gerät kann aufgrund von Firmware Einschränkungen nicht gesteuert werden." (The device can’t be controlled because of firmware

If that hasn't resolved anything, the next step is to turn the touchscreen off and on. Press Windows key + X and click Device Manager. Double-click on Human Interface Devices to expand the category. Right-click the HID-compliant touch screen and select Disable device. You'll be asked to confirm this, so click Yes.

Open PhoneRescue for Android > Click the Menu tab on the upper left of the screen > Click Choose Language > Choose your preferred language > Click Getting Started. For Windows: Open PhoneRescue for Android > Click the Menu tab on the upper right of the screen > Click Choose Language > Choose your preferred language > Click Save.
iPhone 8 and above: Press and release the volume up and the volume down buttons concurrently, and long-press the side button and release it when the Apple logo appears. 7 and 7 plus: Long press both the volume down and the power buttons at once and release on seeing the Apple logo on the screen.
In the case of LG, with the phone off, press and hold the volume down and power key until the LG logo appears. Then release the power key and press and hold it again. When the factory data reset screen appears, release all keys. Use the volume keys to scroll through the menu and, within the Factory Data Reset options, select Yes with the power key.
My Huawei P20 PRO screen suddenly stopped working and it shows user data locked. I an not so sure. About an hour - Answered by a verified Mac Support Specialist
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huawei p20 touch screen not working