Official Firmware aka OFW

It is not advisable to update to OFW if you already have a CFW enabled. Use it at your own risk. compliments to pspcustomfirmware and pspslimhacks

• 6.xx
• 6.60
• 6.60 for PSP Go
• 6.39
• 6.39 for PSP Go
• 6.38
• 6.38 for PSP Go
• 6.37
• 6.37 for PSP Go
• 6.35
• 6.35 for PSP Go
• 6.31
• 6.31 for PSP Go
• 6.20
• 6.20 for PSP Go
• 6.10
• 6.10 for PSP Go
• 6.00
• 5.xx
• 5.50
• 5.03
• 5.00
• 4.xx
• 4.05
• 4.01
• 4.00
• 3.xx
• 3.90
• 3.80
• 3.71
• 1.xx
• 1.50