It's BACK!!!!!! The exploit seems to be for all PSPs!!! Yes, even the 3000, I guess a homebrew loader is coming for the 3000 soon!!!!!
From : http://www.qj.net/Hello-again-World-.../49/aid/130342
t didn't take MaTiAz long to deliver on a promise, so here it is - the new version of the Hello World TIFF exploit for FW 5.03. As for the other promise of "awesomeness" that he told us about in the previous release, well, we'll have to wait a bit more for that. In the mean time, let's knock ourselves out with this one, which is already "awesomeness" as it is.

This version is compatible with both the PSP Slim and Phat, just as promised. Perhaps we'll need to wait for the next release for PSP-3000 compatibility.

Developer notes:

Just copy the files to the memory stick root, disconnect USB and go to photo menu. Don't dismiss the exploit even if it doesn't work on the first time, it's *very* unstable. You might get it working on the first time, but you might as well have to try it 20 times!

The h.bin is loaded to 0x08800000, and the text address of paf.prx is passed in $a0 to the binary code. You can then trick out function imports, like for example sceDisplayWaitVblankStart: sceDisplayWaitVblankStart = (void*)(paf_addr+0x15F068);

Instructions:
1. Copy either slim.tiff or phat.tiff to /PSP/PHOTO/ folder on the memory stick, depending on
your PSP model. Do NOT copy both!
2. Copy h.bin to the root of the memory stick.

So what're you waiting for? Head on over to DL and get this new baby running! Enjoy