I have a PSP Version 1.51/1.52, Is there anyway I can Downgrade to 1.5?
. You can’t actually downgrade, but you can upgrade to 2.0 or 2.6, than downgrade (Question 6 in this FAQ for downgrading 2.0, and question 107 for downgrading 2.6/2,5). Note, Don’t upgrade using the Network, or it will upgrade to 2.X0 (The latest firmware so far) and you will not be able to downgrade from there.