Display MoreNot all Mecool M8S Pro+ L have that button.
Mine doesn't so I just rebooted it in Android using ADB or inside Android since it is rooted already:
Install Termux in Android, open it and then
This will reboot it from SD
Just to confirm. The box in the picture is a Mecool M8S Pro+. It is not a Mecool M8S Pro L.