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Don't have /apps_home/PS3_game .
What am I missing?

If you're getting an error running it from the xmb, it's because it doesn't work. Use FTP.

It's not just that. I simply do not have that folder visible in the XMB whatsoever.

You're not meant to have that folder.

You could only use it with psjailbreaks on 3.41, it's useless with CFW and 3.55

So how do I boot backups if I have them? I used Open Manager 2.1 to backup a game, now how do I load it?

I tried going to Open Manager, highlighting the backup, and loading it, but I simply get returned to the XMB

Anyone? I know I'm a noob to this. Is it even possible to boot backups on 3.55 with open manager? I have to use DEREKTROTTERftw as as backup manager otherwise, and when I open it, my only option is "dev_hdd0."