I've got an old Asus box with an Athlon 64 4400+
This is what I've been able to do without a reload:
Machine starts and locks up. (This is probably where you are now)
I hold power till it shuts off, then turn it on.
It starts, then ends up with the same lockup at the Windows logo.
I hold power till it shuts off, then turn it on.
It starts, then finally says it's going back (forget the last wording)
It does stuff for a while, then either puts itself to sleep or reboots,
If it sleeps, wake it up.
After it boots, will then uninstall the update, which takes a while.
It may go to sleep at this point. Wake it up then reboot it. If don't wake, kill the power again.
Bring it up, should then come up normal!
Quickly log in, then download wushowhide.diagcab from Microsoft (search for it, easy to find)
Run it, then tell it to hide the update (KB4056892) and at this point you should be good.
Still unsafe to reboot. I had it reinstall again and had to redo the above steps. But I am posting it from the Athlon 64 X2 4400+ machine right now. So you're not dead, but it's a weird set of steps.