I have to pull the power out of the back to shut it off, box so far boots up fine...though it gets quite warm after running for a while (kodi with retro mania (no games installed) froze and had to manually close it from the open apps screen (swiping to close is a pain with a mouse btw).
I am a little leery about trying to update again, might not be able to reboot successfully.
If more info is needed about the box let me know...