2.71 to 1.5 possablilty

[crait]

Yes, you can indeed edit the param.sfo, so that the psp will start the update, because it sees that the UPDATE_VER key is set to something later than what you have. However, once it boots it checks the version in the param.sfo with the one locked away in the data.psar and it fails that check, so you will get an error saying The Update is corrupt.

the psp checks for the consistancy of the update file every nth second, it checks about 10 places, including the sfo, psar, .psp, modules etc.

the nth second, i think, is changed every update

also, when opened with an editor, the update file 'brakes'
the signiture it holds is very fragil

[andrew24]

ok
________
buy silver surfer

[sgt.dicks]

then y not get a file viewer that only cheaks with has changed with the cover with the update then change it with some thing so it putts the update saying it is from sony

[crait]

well
you cant
sony made the program used for that
and sony wont release it
thats why

yo yoy oy

[sgt.dicks]

y dont the psp hacker make a program like sonys it would not be that hard


p.s is all playstations coding in hex?

[BrooksyX]

look this was tried way back when people were trying to go from 1.51 to 1.5. Guess what it didnt work. So untill there is an exploit that allows for kernal on 2.71 there will be no downgrader.

y dont the psp hacker make a program like sonys it would not be that hard

p.s is all playstations coding in hex?

They dont make one because they need the encryption key from sony and i am 9999.9% sure that key will never be leaked or figured out.

and most of psp code is written in C.