Had same problem. Went through all the steps recommended, but no help. When I attempted to reinstall Windows from a USB it failed because I had Bitlocker on. When I went back in to disable Bitlocker, magically the keyboard and trackpad worked again.
I'm willing to bet that attempting to reinstall Windows had the same effect as disconnecting from power and holding the power button for 30 seconds.
Whatever this driver does, I'm betting it can only be reset after the device is completely powerless. Who knows.