Downgrading a PSP means to change the installed Firmware to a lower version, for example, downgrading a Firmware 2.00 PSP to Firmware 1.50. Sony does not allow downgrading, however, various exploits have been found that allow selected firmware versions to be downgraded. Downgrading is a risky process if the instructions are not followed, and could brick your PSP.
What is meant my Downgrading a PSP?
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