@windg That's a good suggestion. I'll try a different psp game to get it to work. This is my first time with psp roms.

@drdave79 if /etc/emulationstation doesn't exist it would break standard retropie - that's where the carbon theme is kept. can you show a screenshot of how you're trying to navigate to it or something like that?

Do you know how to remove the "custom override" so the es_systems.cfg gets properly updated?

it shows you where it is in the error message - just delete the whole file. obviously that will remove all the custom changes you've made, so if you want to just fix this system you replace it with what's in /etc/emulationstation/es_systems.cfg for the psp.

@mitu Checked the etc file, and transferred the ROMs via WinSCP.

Over at GitHub, they recommended downgrading to a previous version. How can I go back to before 1.6.3 PPSSPP?

Thanks guys I'll install a psp emulator 😎

CSO compression works fine with PPSSPP.