PSP Firmware 4. 0. OFWQUOTEangjk Jul 6 2. PMi used to have lots of isos n pd games until now i soldgave away everything n now trying to play ori altho can onli afford mgs. QUOTEnicky. 11. 12. Jul 1. 6 2. 00. 8, 0. PMy iso game is diffrent with the umd gameQUOTEIchigo Jul 1. PMmeaning still can downgrade if use pandoraHow to put. PSP 4. I think this question violates the Community Guidelines. Chat or rant, adult content, spam, insulting other members,show more. I think this question violates the Terms of Service. Harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing, show more. If you believe your intellectual property has been infringed and would like to file a complaint, please see our CopyrightIP Policy. Hi I have purchased a PSP 4. I am told by my friends that it can not be modified to play downloaded iso games. Is this true, if not can. PSP Custom Firmware 4. M33 PSP Firmware, Custom Firmware, PSP Downloads, As the latest addition to the M33 firmware series, 4. Pilot Program Synonym. M33 introduces multilanguage.