so I dug out my o3ds that was downgraded using gateway to 4.2.0-9U way back when it was the only way to do so. lately I've been thinking it's time to a9lh by updating to latest version and following the holy guide. however, upon attempting to system update, recovery mode update, format system and system update it always errors out. the sd card was removed, formatted and re-installed and then system formatted to no avail. I recall at some point something was said about GW doing a very sloppy downgrade and there was a cia checking homebrew for duplicates and such, etc, but I can't find it anymore. is anyone familiar with my situation and have any advice?