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
