cant get cso running on a 3.40 oe A PSP
i have the iso in the iso folder
what config do u need to run it?

Which CSO is it? If it's a bad CSO, just download another copy of it from somewhere else. I've also found that uncompressing some CSO's to ISO work better that way too. Also, if no other CSO's work, try reflashing 3.40OE-A.

Might wanna try taking the UMD out and changing the NOUMD hack to on on the Recovery menu (or off and putting a UMD in)

i have kinda the same prob...... but my iso starts up then gives me and error

Try this setting. It has fixed many peoples problems.
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Use No-UMD - DISABLED (Remember to put a UMD in the drive)

Recovery Mode > Advanced > Advanced Configuration
Plain Module in UMD/ISO - ENABLED
Execute BOOT.BIN in UMD/ISO - DISABLED
Use isofs driver also in UMD-inserted mode - DISABLED

i recoverd ti 1.50 then flashed to m33-6 and now they seem to work

Glad to see you got it working. Good luck with it!