Can't turn on after latest update (kernel), no response to touch input, USB keyboard not working - #10 by irvinewade (and follow the link)
Or maybe you could remove the offending package and then flash-kernel
These might not be exact though because I don’t have a non-working system yet / may not have that update yet.
These options assume that the system is stable enough to complete those commands, which seems to be the case based on the OP.