Not long ago a new custom firmware surfaced from the TodoPSP Team… Heard of em? Yeah, I haven’t. So ready your Pandora Battery if you’re in the same boat, and also if you’re in the experimental mood, you may be reverting to 5.00 M33 soon thereafter. Personally, I’ve yet to try it.

The package includes tdpDevkit (for Windows), which allows you to patch homebrew should it be incompatible with 5.03 TDP-3. The readme includes an example for patching iR Shell.

Download:
Custom Firmware 5.03 TDP-3
PSP Firmware 5.03