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1. Copy the downhelper100 folder to /PSP/GAME/ and start the program.
2. The program will dump your flash and your ipl to the memory stick. After it's finished, the program will exit.
3. You should now have a folder labeled DOWNDATER on the root of your memory stick. This is the file that will need to be passed to the 1.50 user.
Instructions for the 1.50 user
1. Copy the two folders __SCE__downdater100 and %__SCE__downdater100 to /PSP/GAME/
2. Get the DOWNDATER folder from someone with 1.00 and put it in the root of your memory stick.
3. Get the official Sony 1.50 update and put it under /PSP/GAME/UPDATE
You are now ready to start the downgrade process. Please make sure that your AC adapter is plugged in and the language of your PSP is set to either English or Japanese.
4) Start the program from your XMB. Do not shut your PSP off or take your memory stick during this process as it will result in a bricked PSP.
5) After a few minutes of red text running across your PSP and your memory stick light flashing, you will be prompted to manually shut down. Do so by holding the power button up until the PSP shuts off.
6) Power on your PSP and if everything went well, you will now have a 1.00 firmware PSP.
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