I'm using #MXLinux on #LiveUSB and tried to rollback it to previous remaster. However, I had updated the kernel to newer version before.
In effect, the OS "didn't finish up booting", or, rather threw (as I saw after Alt-F1) an (uncritical) error about new kernel unavailable and booted up to CLI. To recover from this, I used the same live-kernel-updater, but rolled back the kernel version instead of updating. This recovered the system.
This should be helpful also for #Antix users as both distros share their LiveUSB utilities.