hey guys, i am trying to flash back to android firmware from coreelec , my m8s pro + doesnt have a reset button to enter recovery , is there an ssh command to boot from sd card?
There should be a hidden reset button, if you don’t have one at all then you can short the pin’s.
Several examples are given here in the HowTo’s (seek, and ye shall find) 
nothing works since i have allready coreelec at internal , and there is no reset button i opened the box , there are those points where the reset button should be , now i need to learn how to solder
if there are points, then simply connect them with a screwdriver or short cable during boot process to reset the box.
I know this is a bit late. I have just purchased a Mecool M8S Pro L. As some people may be aware there is no reset button.
I used this method.
Terminal Emulator : boot to Android, insert CE prepared SD / USB, install Terminal Emulator app (either from Google Play or APKMirror), run it and type reboot update . Your box should reboot to CE.
But after trying several Terminal Emulators, I found this one worked