loadiine will not work with aroma, probably tiramisu as well, since it's in elf format. however, since it obviously boots up for this person, he's probably using some form of haxchi. I know loadiine worked on 5.5.5 as I've tested it on cbhc. downgrading is possible, but extremely dangerous. I think it involves downgrading the versions.bin version numbers, then installing the apps. I wouldn't suggest it as there's a possibility that even cbhc won't save you from a screw up.