If you have OE/M33 firmware lower than 3.52 M33 please start from Section A. If you have OE/M33 firmware equal or greater than 3.52 M33 and lower than 3.52 M33-4, please start from Section B. (E.4) Go to Recovery mode (Power off your PSP by holding the power button for 10 seconds. O.4) Official firmware update 5.00 Files to be downloaded and extracted: (a) Custom firmware 3.52 M33 (DL. Revert your kernel to 3.52 (or any kernel above 3.52 like 3.90). (C.5) In your PSP, browse to your Memory Stick and run the program ).Changes in 5.00 M33-6: - Fixed a bug that made unbootable psp without memory stick or with a bad one.Changes in 5.00 M33-5 ---------- This update is a try to fix memory stick low speed since 3.80.
(C.4) Go to Recovery mode (Power off your PSP by holding the power button for 10 seconds.Instructions: Copy UPDATE folder /PSP/GAME/ and run.