Comment # 3 on bug 1205639 from Marcin Gondek

I confirm the same issue.
Booting/upgrading on 6.0.8 made ethernet card renamed.
Symlinking from ifcfg-eth0 to ifcfg-end0 and ifroute-eth0 to ifroute-end0 did a
trick.

Anyway, the kernel 6.0.8 won't boot still on 2xRPi 4.

So I need to boot to old one, 6.0.3 and via console update the interface files.

I can't provide now more info why 6.0.8 won't boot, blank screen, cursor
disapear and finally HDMI output is down on RPi.