• Connect the PSP via USB.
• Format a memory stick with the included “mspformat” tool.
• Use “msinst” to install the 3.90 IPL onto the freshly formatted memory stick.
• Insert the memory stick into the PSP to be TA-088v3 tested.
• Turn it on with a Pandora Battery. Two (2) possible results:
• PSP immediately turns off — your PSP is NOT equipped with a TA-088v3 motherboard.
• PSP stays on with the green light — your PSP is a TA-088v3, or perhaps youÂ’ve done something wrong. ContinueÂ…
• Connect the PSP via USB again.
• Repeat the above steps with the 4.05 IPL. Again, two (2) possible results:
• If the PSP turns off immediately with this IPL and it previously remained on with the green light — this indicates a TA-088v3 board.
• PSP and the green light remain on — youÂ’ve likely done something wrong. Try again.
• Whatever the indicator — the TA-088v3 ainÂ’t hacked yet.

Via PSP Hacks