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That was a bad idea. You need to downgrade again, and you need a pandoras battery to do that. I believe you accidentally updated from custom firmware to a more recent OFW version. You can't add games with OFW, only CFW.
Download MPH Downgrader and Firmware version you want(e.g 1.50) to the Windows-based computer. Connect the PSP Slim to the computer's USB port using the USB connector. Transfer the two programs to the main folder of the PSP Slim. Disconnect the PSP Slim from the computer's USB hub when the transfer is complete.
Turn on the PSP Slim. Go to the Settings/USB Connection in the Home menu and select the EBOOT.PBP file in the PSP\GAME\UPDATE update folder. Extract the MPH Downgrader zip file to the root folder of the PSP. Click OK using the X button if you are prompted that this will replace some files.
Go to Photo/Memory Stick in the Home menu. Wait as the screen goes black and numbers appear. Wait two minutes and then press and hold the power switch until the PSP Slim turns off. Release the power switch.
Wait as the PSP Slim turns on and reboots. Go to Game/Memory Stick in the Home menu and select PSPS Update version 1.50. Press the X button to start the update.
Wait as the update finishes and presents an error message. Press the O button to restart the PSP.
If you have the PSP 2000 (slim with a wide ring on the UMD door) there is a chance you can't downgrade depending on your motherboard. Pandora's Battery and MMS is required to 'jaibreak' your PSP if you are on Sony official firmware.
First, try to determine your PSP's version. If it is the PSP 3000 (PSP slim with a narrow ring on the UMD Door), you can only play game demos from the PSN and can't be modded as of this date. If you have the PSP 2000 (slim with a wide ring on the UMD door) there is a chance you can't downgrade depending on your motherboard. Pandora's Battery and MMS is required to 'jaibreak' your PSP if you are on Sony official firmware.