Broken eMMC boot

[annahellrothsparent]

I have a PBP (2021 batch) and screwed up the original Manjaro KDE eMMC image with some combination of cups and display resolution mischief. I have been using Armbian successfully from a microSD card but want to fix my eMMC boot. The only image of Majaro that targets eMMC specifically is this one, but it's way out of date. I have since tried to update packages etc but am running into pretty difficult challenges getting things updated to a point where I could update the OS to a current version (namely I can't access the current mirror list). This is preventing me from using the manjaro-arm-installer package that would help update OS. Has anyone else run into this issue and solved it? Or is there another OS with a current eMMC version?

Thanks for any advice!