Happens to me all the time...
What I do is:

Connect it to a pc usb port, and leave it there... don't try to turn it on... It might turn on by itself. Leave it be, it'll shut down again...

After 15 or more minutes... unplug, turn it on... then continue charging...

You need to install KP for uboot from the repo, not the normal kernel... It will download the kernel image and update the boot screen.