Hacking A later version of the system software is already installed

[ShadowFyre]

My PSP Go is version 6.60, I upgraded from 6.37. Can't seem to downgrade to 6.20 as I get that error message. I want 6.20 b/c of its permanent custom firmware, regardless of the 5 second wait I'd usually have to deal with. Could someone link me the downgrader and firmware needed for this? I've been at this for hours.

 

[BORTZ]

I thought there was a way to get 6.60 permanent?

 

[s4mid4re]

I thought there was a way to get 6.60 permanent?

Not on a psp go. It only works on a psp 1000/2000.

Spoiler: Downgrading a 6.60 PSP to 6.20

If your PSP is on 6.60 right now but has had 6.20 or less installed at any point in it's life (meaning it's a 07g motherboard line or below) then you can use this to downgrade it to 6.20. If your PSP came with 6.60 installed out of the box then you can still downgrade, but there's potential risks. While workarounds have been found for issues that arise, you should still be careful about doing this if your PSP came with 6.60 out of the box.

• Download ChronoSwitch Downgrader.
• Go into the /Chronoswitch_version(x)/ folder in the download, and drag the PSP folder onto your memory stick. If you're asked to merge the folders, say yes.
• Download 6.20 official firmware (for PSP 100X/200X/300X) or (for PSP Go).
• Take the EBOOT.PBP file from the 6.20 firmware and put it in the /PSP/GAME/UPDATE/ folder on your memory stick, creating it if needed. For the Go it needs to be on the internal flash, not the M2 card.
• Run the Chronoswitch Downgrader on your PSP to start the process, and it will use the official Sony update process to "update" you to 6.20.

Rydian's full guide here

All of the links are provided within the spoiler (downgrader + 6.20 ofw for go), as well as instructions. Note the part "For the Go it needs to be on the internal flash, not the M2 card" and make sure you put the files in the correct place.

Just a note, all Go's come with 5.70 stock (those with higher firmwares were simply updated for obvious reasons), so you don't have to worry if it can be downgraded or not.

 

[BORTZ]

oh oh.Yep you are right. I have a 2000 so thats why i was confused.