Yoshihiro ha mandado un mail a varias webs sobre PSP inglesas diciendo y dando datos de todos sus avances y a puesto en descarga los ficheros para hacer el Downgrade y los pasos a realizar.
Si no es aun un 100% para versiones +1.52 almenos esta la cosa cerca y da las pistas para q otros retomen el trabajo y se pueda realizar esto.
No es tan malo como lo pintan. Quien sepa ingles q disfrute, paso de traducirlo.
"Lo all even you up there who again insulted me this
morning I salute you.After all this bullshit stories
I'm gonna told ya how to downgrade, & as I can't
finish it for personal reasons (and alot of wab;
(??..) & I'd like to apologize for all this mess, the
downgrader makes too much noise.
he 1st solution with wich we did the vid is simple but
stuck the 3rd verification crying.gif .I send U the
Eboots directly & will told you how method 2 works.
So, you need 2 MS & don't forget to prepare them with
the directories that comes in the RAR file. All on
"MemoryStick1" goes to MS1, All on "MemoryStick2" goes
to MS2
here comes the method to brake the 2nd lock of
"updater" you gotta run the 1st Eboot on ur PSP 1.51,
1.52 or 2.0 You'll see a blank screen & as the screen
turn to black press 3 times "power" the PSP turns to
"hibernation mode". take ur time & switch 1st MS by
MS2.
When everything is ready press power to turn off
"hibernation mode" the PSP load update correctly &
says "update 1.50 ready to run" as if it was launch
from firmware 1.00
There, it's stucked & it's the last check ther is on
update. we did well after but rest of the job is
secret
For method 2 it's a MD5 that is in eboot.pbp of update
so if U modify any byte of updater it'll be launched
but under the psp updater you'll see a nice alert
saying "your update is corrupt & couldn't be launched"
this MD5 is so big & "flashy" nobody talks bout' it.
it is located at last line of eboot under "psar" it's
for that the updater check that no modification were
made to eboot.
this MD5 isn't in UMD games updater, that's the trick.
the answer is Sony knows very well that U can't copy
UMDs so they didn't add a security to check if psar
has been modified.
I didn't find out how to calculate this MD5 & find
what it corresponds to. but it's the answer !
last thing for the "UMD executable updaters" as 2.0,
they are all the same as the one that can be launched
from MS but they are signed differently with a special
UMD flag so for the PSP it's impossible to launch it
from MS.
Why did I decide to told U how it works ??
for U can finish the downgrader, I can't keep the job
secret it's a free project & I hope you can finish it.
thx for ur supports.
Amicalement Yoshihiro
best
- Xskorpion you will not be the first to get this as
im sending it to other sites at the moment in the
event you choose not to post this.
i've tested this on my v2.0, my psp is not bricked, it
goes to the v1.50 update start screen, but when you
start it a message comes up says 'there is no need to
update', but it is promising, a little."