I have a bunch of comments and questions regarding the u-boot log you posted. Technically it’s not even a u-boot log because your bootloader doesn’t even get as far as loading u-boot. Could you start a new thread where you explain what you did and how you ended up in this situation? I think this would be useful to help others avoiding to run into the same situation. Especially because most people probably don’t have a cm4io board around with which they could fix this. I think it would be best to have this discussion in a new thread instead of hijacking this one.
@G3M I’m unable to reproduce your issue but I also only tried 6.18.5 and not 6.18.3 and @rpm said that 6.18.5 works for them. How do you feel about attempting to upgrade to 6.18.5 and see how it works? If it fails, recovery might be easier using this new script I wrote yesterday: Testers wanted for new tool reform-rescue-shell (maybe interesting for users with the gdm issue)