Most arm devices get a factory image, and maybe a update, also a factory image
All debugged and mostly reliable
Only SBC and hacked set-top boxes get a variety of os's, you see posts
in the tv box forums about which is the pin to short emmc to force a sd boot
Given the variety of hardware that uboot runs on, it is amazing it does so well
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So, if you can get a sd card boot, that will be easiest, after that not so clear what is best
I think personally, I would try to set (edit) extlinux.conf back to the previous version
There might be a backup extlinux.conf that just requires a (2) renames (ie, save new one as bak2)
All debugged and mostly reliable
Only SBC and hacked set-top boxes get a variety of os's, you see posts
in the tv box forums about which is the pin to short emmc to force a sd boot
Given the variety of hardware that uboot runs on, it is amazing it does so well
---
So, if you can get a sd card boot, that will be easiest, after that not so clear what is best
I think personally, I would try to set (edit) extlinux.conf back to the previous version
There might be a backup extlinux.conf that just requires a (2) renames (ie, save new one as bak2)