Interesting. I have seevral .swf files. They are random ones i found from /f/. I don't know. They get as large as 25mb sometimes. I also am having alot of trouble running isos. I've got a few isos that won't run (Need for speed most wanted, and Phantasy Star Portable) and wheneveri try to decrypt or convert a CSO file, my PSP just goes black and shuts off too. I'm running 6.60 LME 1.8 and PRO-C, meaning i've tried both for getting these isos to work. I 've switched my iso driver from m33 to inferno and i've tried the Normal iso driver on 1.8. Sorry again for the information overload.
You cannot load .swf files larger than 1MB on a PSP, why not use your PC or PS Vita? There's a high chance they could work.
For the ISO & CSO files maybe some plugins you've enabled are preventing the games from loading. Press SELECT to show up the VSH menu, then go to the Recovery meny>Advanced>GAME plugins>disabled. If you're on LME, these GAME plugins can be simply disabled from the VSH menu. If the plugins were disabled & the pirated games are still not loading, that means the problem is from the files; they may have not been downloaded completely or the website hosting them may not be doing so correctly.
If that's the case, PM me so I can give you a website for pirated games (I can't post it here)