Official firmware won't run homebrew or backups. You need custom firmware for that. There are two ways to go with that: Pandora's battery with Magic MemStick, or a software downgrader. The PB-MMS is better, but if you don't have a friend with an already customized PSP, it's harder to do. If you have a friend with a PSP already setup with custom firmware, consult the sticky threads on Pandora and DCv8. That would be best.
Assuming you're all on your own, you'll need to run a software downgrader to downgrade your Phat PSP (since you have 2.60, it MUST be an old Phat PSP) to 1.50. Then you can run the 3.52 M33 custom firmware installer. Then update that to 3.52 M33-4. Then update that to 5.00 M33-4. It's more work, but doesn't require anything special.
The first downgrade to 1.50 is the one to be the most careful about. You can't go straight from 2.60. You need to update to 2.71 EXACTLY first. 2.71 and 2.80 had software exploits (picture viewer exploits to be exact) that allowed you to get into kernel mode so that you could overwrite the Flash ROM in the PSP. So you want to either update from 2.60 to 2.71 or 2.80. When I downgraded my Phat, I went to 2.71. Once you're at 2.71, you can use the 2.71 Downgrader to get to 1.50.
http://forums.exophase.com/showthread.php?t=563
That's a nice guide over at exophase on downgrading from 2.71 to 1.50. It links to all the files you need and shows how to do everything step by step. Be sure to read through EVERYTHING before doing anything. Make sure you understand what you're trying to do, and ask questions about anything you don't understand BEFORE trying to do something. Better to ask than to screw something up.
Once you're at 1.50, then you can go to 3.52 M33 using this guide:
http://forums.exophase.com/showthread.php?t=2732
Then you update that to 3.52 M33-4 with this update:
http://exophase.com/files/psp/M33-1234.zip
Then you're ready to update to 5.00 M33-4:
http://forums.exophase.com/showthread.php?t=9447
Again, read through everything FIRST before doing anything!
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