This is a guide on how to recover to fw 1.50 for all those who've not made a backup of their flash0 and those wishing to roll back there psp to a lower firmware. Once you've recovered to 1.50 you can then re-install your cfw.
Please note this is for M33 3.52 or below this will not work for M33 3.71+ or for the slim
1. Go into recovery mode and enable USB
2. Create a folder called recovery in the game folder of your ms the path is ms:/PSP/GAME/RECOVERY and copy the contents of the 150 recovery.zip here
3. Exit USB and then click run program at /PSP/GAME/RECOVERY/EBOOT.PBP
4. Follow the on screen instructions
5. You have now recovered to 1.5 and can now re-install your cfw and then take a backup of your flash0
Get your 1.50 recovery file here: http://www.mediafire.com/?dwtjzezlzjf
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