This is a tutorial on how to access PSN after updating from Debug firmware to 3.55 Official then 3.60. For some odd reason if you do this you are greeted with a Nice DNS Error (80710104) you can try power cycling your router and PS3 or resetting your internet settings but if that doesn't solve your problem. Read on...
1.Navigate to Settings > System Settings > Restore Default Settings
2.Thats it, enjoy PSN..