Renown homebrew author, Dark_AleX, released an experimental downgrader yesterday which we refrained from posting as it reportedly bricked many PSPs. Today Dark_AleX has released the Downgrader Test v0.2 source code - no binaries, no accidental bricking! This is strictly for the purpose of developers to analyze and advance on for the possibilty of a stable 2.50/2.60 downgrader. Until then, sit tight - donít try and downgrade your PSP just yet.
Quoted from the readme.txt:
The downdater is mostly confirmed not to work. I update a slightly modified source code. It should be relatively more secure. I donít provide the binaries.
I found two glitches in the code:
1) The restart functionÖ Originally it was intended for a restart, but it did nothing, making possible that if some premature error before doing the real thing failed to continue the real downdate process. Now it will cause an on-purpose exception (this only will happen either at the begginiing before the unsecure code begins or at the end, when all is finished)
2) Now Iíve re-assigned the flash device after the logical format. Probably more secure.