If you want to try this, do so at your own risk.
--------------(THIS WILL ALSO FIX THE RECOVER LIGHT ISSUE)--(BACK UP YOUR FLASH0 FOR LATER REFERENCE)---------------
This fix is for PSP systems that have the brightness problem. To test if you PSP has the brightness problem, you can either:
1. Start a 1.50 firmware homebrew program on your PSP (like an emulator) and press the brightness button a few times.
2. Access recovery mode and press the brightness button a few times. <- probably the easiest way to check. PSPs with the brightness problem will have the backlight in the recovery mode or homebrew games go in reverse: e.g the Backlight may go: 4, 3, 2, 1, off or 3, 2, 1, off instead of 1, 2, 3 or 1, 2, 3, 4 as the PSP should normally do. (Note: 1 is the dimmest settings and 4 is the brightest setting)
If your PSP doesn't have this 'brightness problem' you do not need to apply this fix.
Applying this will also fix a small 'clock' bug: Before applying the fix, when the time is 12:xx AM or 12:xx PM and you are running 1.50 homebrew, when you press the 'home' button the clock will show 0: xx AM / 0: xx PM after applying this fix you will see 12: xx AM / 12: xx PM instead.
This modification uses 128kb of your flash0 and uses unencrypted versions of 3 files from 2.70 instead of the 3 files from 1.50. You will need to re-apply this fix everytime you install a new custom firmware. e.g if you update from 3.10 OE-A to 3.40 OE-A you need to apply the fix. You shouldn't need to re-apply the fix after minor updates like 3.10 OE-A to 3.10 OE-A'.
(YOU CAN APPLY THIS TO 3.51M33 IT WILL WORK)
(DO NOT APPLY TO 3.51M33-7 OR UP)
Required Files: TA-082/TA-086 Brightness Fix files:
1. Download the 'Brightness.rar' and extract it to a folder on your Desktop.
2. Fully turn off your PSP by holding the power button for 4 seconds.
3. Turn on your PSP while holding the 'R' button, your PSP will enter the 'Recovery mode'.
4. Connect a 'USB Cable' to your computer and to your PSP.
5. Highlight the 'Advanced' menu and press 'X', highlight 'Toggle USB (flash0)'
6. Open 'My Computer' and single right click the new 'Drive Letter' ( e.g Removable Disk E: ) and choose "Properties"
7. Check that the 'Free Space' left is 128kb (131072 bytes) or higher. The space left on 3.10 OE-A' should be about 400kb and 3.40 OE-A is about 240kb If you have 128kb or more free space on flash0: then you will have enough space to apply this fix. Press 'Cancel' to close the 'Properties' window.
8. Make a new folder somewhere on your Desktop and name it something like 'Brightness Fix Original files' This folder will store the 'original files' as a backup. If you find that the fix doesn't work correctly you can always copy the original files back to your PSP.
9. Double click the 'Removable Disk' to open it, next double click the 'kd' folder (Thats not a spelling mistake, you need to open the 'kd' folder, not the 'kn' folder) 10. Copy the 4 files you extracted from the RAR file in step 1 and paste them into the 'kd' folder. (The files already have the correct name, You do not need to rename any of the files.) display270.prx + impose270.prx + lcdc270.prx + pspbt_game.txt and the pspbtcnf_updater.txt
11. On your PSP, select 'Toggle USB (flash0)' to disable the 'USB Connection'
12. Disconnect the USB Cable from your PSP and your computer.
13. Exit Recovery mode and start a 'Firmware 1.50' homebrew. e.g The Radio app
Your brightness problem should be fixed...
(I Have Added An Extra File That Will Make The Brightness Issue Go Away In Recovery Mode)
(This must be applyed every time you update your psp on CFW,UNLESS ITS SOMETHING LIKE IE OR ECT.)
POSSIBLE TO BRICK YOUR PSP
Useing this could brick your psp,or semi brick your psp,so dont alter any of the files an any way.
(DO AS THE INSTRUCTIONS SAY.AND YOU WONT BRICK )