Ultimate Downgrader Thread
The following guides are for downgrading the firmware of PSP 1000 models running 3.50 firmware and lower only. If you have a PSP 2000, PSP 3000 or your firmware is above 3.50, look at other options for hacking your PSP. These will not work and could damage your PSP.
All of these guides have the aim of getting your PSP to version 1.50 using purely software hacks as an alternative to hardware methods (Pandora Battery), from which you can then install Custom Firmware. Click the link at the end of each guide for details on how to do that.
Disclaimers:
1. Any downgrader has potential to brick your psp, so proceed with caution and at your own risk. If you brick your PSP it CAN now be recovered, but you will need additional hardware for that (Pandora Battery).
2. ALWAYS downgrade with a fully charged battery pack and the psp plugged into the ac adapter.
3. Only download the software from well known sites linked in the guides.
4. Follow the directions carefully to avoid possible damage of your psp.
5. For safety reasons, please use a reformated empty memory card when attempting to downgrade. Backup any data before reformatting.
6. throughly read the README files that come with all software. most questions can be answered there instead of asking in this thread
PSPMod.com or any website you download software from is not responsible for anything you do to your own PSP. All of the guides given here are however fully tested and known to work.
Summary:
There are downgraders for the following firmwares. Please note there are other downgraders available, but these are the 'best' to use, so if you have firmware in between these downgraders, simply update manually to the next firmware with a downgrader. For example if you're running 2.50, update to 2.71.
2.00 - Requires the MPH downgrader.
2.71 - Requires the "red screen" downgrader
3.03 - Requires an unpatched copy of 'GTA Liberty City Stories'.
3.50 - Can be downgraded with a copy of 'Lumines' (US or EU version only)
2.00 Downgrader
(Tutorial By. Elliot Phillips @ Hack-A-Day.com, modified by killer @ PSPMod.com)
This will work on any PSP that is running the 2.00 firmware and has never run firmware above that. If you have downgraded from another higher firmware this may not work.
Step 1a: Download the downgrader by clicking here.
Step 1b: Download the 1.50 EBOOT by clicking here. Rename it EBOOT.PBP, rather than 150.PBP.
Step 2: Connect your PSP to your computer via USB. On your memory stick, create a folder called UPDATE inside /PSP/GAME/ and place the EBOOT.PBP file from the 1.50 update inside this UPDATE folder. So you will have X:/PSP/GAME/UPDATE/EBOOT.PBP.
Step 3: Unzip MPHDowngrader.zip that you downloaded in step 1a. Take the file overflow.tif and put into your /PSP/PHOTO/ folder. Put both h.bin and index.dat in the root of your Memory Stick. This is the first section of your memory stick you see when you first open your memory stick. Put them there.
Step 4: Disconnect your PSP from your computer and plug in the AC adapter.
Step 5: Navigate to Photo then Memory Stick via the PSP's menu system and start scrolling down through your photos until you reach the overflow.tif picture. You'll know you've hit it when everything freezes and you get a black screen with a bunch of white text output. If your PSP freezes without going to this black text screen, then hold the power button for about 10 seconds until the PSP shuts down, then hit the power button again to start it back up. Repeat this step until you get that black screen.
Step 6: Don't panic. Hold the power button for about 10 seconds until the PSP powers off. Hit the power button again. Your PSP will start up, and if you navigate to your System Information, you'll discover that your PSP thinks it is running version 1.0 of the firmware. It isn't and you cannot run homebrew (yet).
Step 7: Navigate to Game-->Memory Stick, hit the X button, and navigate to the 1.5 updater. Make sure you have your PSP plugged in or the upgrade won't work. Click the X button and update like you normally would. At the end of the upgrade you will receive an error saying that the upgrade failed and to contact Sony. Don't panic. Ignore this and again force your PSP to power off and reboot.
Step 8: After the PSP reboots you will receive an error screen that is scary and confusing because it is in multiple languages. Don't panic. Find the language you can understand and read the corresponding line. It notes that your preferences are fragged and that you need only hit the O button to restore some default-ish settings. Hit the O button.
Step 9: The PSP will start back up and you will go through the initial setup like the day when you first bought your PSP. Do so and then go to the system info pane again, where you will see that you are rocking version 1.5.
NEXT STEP: Now you're on 1.50 FW you'll want to upgrade to the latest custom firmware. To do this, go to this guide here (GUIDE: How to use Hellcats Recovery Flasher). Follow scenario 1.
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