How to Downgrade PSP 3000 5.51 Firmware 1.50, Downgrading PSP OFW 6.20 -5.51 to 1.50 . A lot of users have been asking on how to downgrade PSP firmware 5.51 to 1.50 to install a custom firmware .
Well depending on your PSP model . From other sources it seem the only way to downgrade a PSP Firmware 5.51 to 1.50 to install a custom firmware is to used a Pandora Battery and MagicStick to help with the Downgrading process. However there is a limit though.
PSP 3000 models and Some PSP 2000 cannot be hack with a Pandora battery . Only leaving those that own the FAT PSP or the earlier version of PSP 2000 models.
There have been a few users who have claim they have been able to hack the PSP 3000 that has a custom firmware 5.51 without a Pandora Battery which is not true. No proof has circulated around the intenet. So is most likely a fake .
Downgrade PSP 3000 Firmware 6.20
But if you do have a PSP model that could be hack and have PSP Firmware 5.51 then you could used the PAndora Battery to put your PSP into service mode which is what is needed to downgrade your PSP OFW 5.51 to 1.50
Using these methods is 100% legal (although Sony obviously doesn’t like it), but it CAN brick your PSP (there is a way to unbrick them, we’ll be discussing that next time). It may also void the warranty of your PSP system as you would be working with delicate parts like the PSP’s flash memory. So if you screw up, Make Use Of won’t be held legally liable. If this sounds like too much risk to you, please don’t go any further.