I have to create a system, where only power switch is available. No touch-screen, no button is accessable.
I wanted to use an old Samsung Galaxy S7 edge for the project with the instruction of:
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But at the end I am unable to access the "fastboot" mode.
FastBoot mode worked on another Huawei P20 lite, but there I have no root access.
So I have 2 Mobile devices and none is working to start when power is connected.
If anyone can help, it would be great.
I just have to autorun my app on start, just when device is connected on USB charger, thats the goal.