Update/ downdate

[Project.funky]

I was just wondering..

if the psp V2.8, doesnt have kernal mode, witch means a downdater isn't possible, then how on earth is the update going update because doesn't that have to accsess the flash0?

[razorak]

all psps have kernel mode, it's a matter of whether homebrew coders have access to kernel mode. Sony has it since they have the encryption codes and all the others codes for the security stuff they chunked into the psp with each upgrade.

[Project.funky]

thanks, but what does it mean when people say the 2.8 and 2.81 and been decrypted

[razorak]

not too sure either

[bullhead]

I think it means that the flash 0 and flash 1 files can be accessed...

[AtariFreek]

It means that the update has been broken downm
and opened, allowing for acces to the flash. It's what DevHook uses to emulate firmware (I Think)

[Project.funky]

if you could modify a firmware update into allowing flash0 acsess beofre its installed on the psp wouldnt that allow kernal mode?

[Eonstar]

You could'nt the encrytion key would be corrupted and it will come up as corrupted data on the PSP

[Project.funky]

why's that?

[jak66]

sony encripts every update eboot they make so it can be run, which is why update eboots work and homebrew eboots dont, if you try to modify the data, then the encription can detect that the data is different to what it should be so it becomes corrupt
when an update is decripted the files for the firmware are decompressed from the data.pspr file in the update, doing this allows the firmware to be run through devhook, making your psp think its a different firmware