Advancements in 1.51...

squiggle · Post by **squiggle** » Tue Jun 28, 2005 12:50 pm

has anyone attempted to figure out how the update checks the version of the current firmware? If that problem was solved on a 1.5 (tricking it to run 1.5 update again) then we'd have something to shoot for altering with a different exploit (saved game, format string, etc).. Its just a question..

FrostAie · Post by **FrostAie** » Tue Jun 28, 2005 1:00 pm

but when i did the ac adapter swap i got one of the 3 errors:
its not pluged in
already have latest firmware
and battary is low
but i checked the battary it said 100 percent

F9zDark · Post by **F9zDark** » Tue Jun 28, 2005 1:50 pm

pinhocarlos wrote:
mvpo.geo wrote:How do you know this is an exploit? When you did this you had 1.52 update in....Im pretty sure that the update is gonna run fine when you have the 1.52 UPDATE in your PSP.
EDIT: if we crate a folder in MS2 named UPDATE and put the 1.50 in it, and then create a folder called UPDATE1 and put the 1.52 in it... what will gona heppen??

is this what U are think???

sorry for my poor english!

Won't work. It checks the update against the firmware version installed on the PSP.

http://forums.ps2dev.org/viewtopic.php?t=2257 This thread outlines(somewhat) what is going on during the update procedure. As I have stated before:

We need a firmware specifically written to downgrade.

HaredX · Post by **HaredX** » Tue Jun 28, 2005 4:58 pm

I think pinhocarlos is on the write track when he says that we should figure out a way to edit the files inside of the upgrade PBP to allow writing the upgrade files of a lower firmware version than the one currently installed to the psps memory. If we can figure out how to comment out the current firmware check in the updater and still be able to run it without it showing as corrupt we might have a shot at being able to downgrade.

pinhocarlos · Post by **pinhocarlos** » Tue Jun 28, 2005 11:19 pm

HaredX wrote:I think pinhocarlos is on the write track when he says that we should figure out a way to edit the files inside of the upgrade PBP to allow writing the upgrade files of a lower firmware version than the one currently installed to the psps memory. If we can figure out how to comment out the current firmware check in the updater and still be able to run it without it showing as corrupt we might have a shot at being able to downgrade.

we get to a point, which one we focus on, disable the firmware check so we can run the 1.50, or edit the 1.50 PBP and change the sfo for the 1.52... like, because if we just change the sfo and put the data.psp to "connect" with it, we will be fine...

pinhocarlos · Post by **pinhocarlos** » Wed Jun 29, 2005 1:13 am

never mind!

like, if we put FW 1.50 in folder UPDATE-1 it runs but if we put in UPDATE not... why?

DrKickflip13 · Post by **DrKickflip13** » Wed Jun 29, 2005 7:34 am

If you put the update 1.5 in any folder other than UPDATE it will run but get a game error. Duh...

FrostAie · Post by **FrostAie** » Wed Jun 29, 2005 7:56 am

i also noticed if u change a the big E to a small e on the end it runs but gives an error but if u do that and do the standby thing it works

pinhocarlos · Post by **pinhocarlos** » Wed Jun 29, 2005 9:21 am

FrostAie wrote:i also noticed if u change a the big E to a small e on the end it runs but gives an error but if u do that and do the standby thing it works

i think the 1.52 have something that it can run and it isn't case-sensetie

pinhocarlos · Post by **pinhocarlos** » Thu Jun 30, 2005 12:36 am

I think it was already mensioned here but here it goes... when we plug in and plug out the AC Adapter a lot of times, it gives an error "battery low, charge battery" i think we need to explore this error and see why this error appers, becuase i was with 99% of battery and this error apper... i think with "this" error we can find the solution of downgrading"

Lollerskates · Post by **Lollerskates** » Thu Jun 30, 2005 12:34 pm

Do that, carlos, and all you're likely to find is the solution to destroying your battery.

sq377 · Post by **sq377** » Thu Jun 30, 2005 1:46 pm

I have a 1.51 psp, and a 1.5. I've tried upgrading hte 1.51 to 1.52, and it tells me it cannot do that. Because the bettery charge is low (100%). Tested this with both batteries, same thing. One of them was new. wiped off my memory stick plenty of times, and redownloaded it. Same thing. This isn't even using a modded version of the upgrade, it just plain doesn't work.

Lollerskates · Post by **Lollerskates** » Thu Jun 30, 2005 1:59 pm

was it plugged in?

FrostAie · Post by **FrostAie** » Sat Jul 02, 2005 4:33 am

pinhocarlos wrote:I think it was already mensioned here but here it goes... when we plug in and plug out the AC Adapter a lot of times, it gives an error "battery low, charge battery" i think we need to explore this error and see why this error appers, becuase i was with 99% of battery and this error apper... i think with "this" error we can find the solution of downgrading"

thats what im thinking dude

AuDioFreaK39 · Post by **AuDioFreaK39** » Sun Jul 03, 2005 8:42 am

The plan I think we should go with is to trick the firmware into upgrading to a "hacker firmware", like a 1.53 (because 1.53 is greater than 1.52), but I think we would still need to be able to crack the checksums in order for it to authenticate the 1.53.

Agoln · Post by **Agoln** » Sun Jul 03, 2005 4:46 pm

AuDioFreaK39 wrote:but I think we would still need to be able to crack the checksums in order for it to authenticate the 1.53.

And how to do that? Even 128-bit encryption, (I'm not sure what it is on the PSP) would take years on a single computer. Have fun cracking! :-P

Tech^CF · Post by **Tech^CF** » Sun Jul 03, 2005 11:51 pm

Agoln wrote:And how to do that? Even 128-bit encryption, (I'm not sure what it is on the PSP) would take years on a single computer. Have fun cracking! :-P

Would or Could? Anyways, I agree it's not a good idea.

imk · Post by **imk** » Mon Jul 04, 2005 6:17 am

this is just an idea i got a few seconds ago, dunno if anybody has though of it or if it would even work...

what if someone wrote some kind of loader that would execute the update... but the loader just wouldnt execute it, it would stay in memory and watch or dump the update files as they are unencrypted and executed?

but then i suppose the problem would be a person needing an older psp to hack at the update... and then youd need a way to encrypt/sign it so it will run on newer psps...

it was just a thought...

HaredX · Post by **HaredX** » Mon Jul 04, 2005 7:33 am

you guys are veering way off track here, we are trying to figure out how we can load homebrew on 1.51, downgrading the psp via homebrew is obviously not an option because you need to be able to run homebrew to do that which 1.51 can't......

Nick Fury · Post by **Nick Fury** » Mon Jul 04, 2005 8:15 am

HaredX wrote:you guys are veering way off track here,

I disagree.

we are trying to figure out how we can load homebrew on 1.51,

True but making it work by way of a downgrade might be the answer.

downgrading the psp via homebrew is obviously not an option

Eh.... not true. Coders make mistakes. I bet that it is still possible to run homebrew on 1.51 and 1.52. You just have to figure out where the mistake is and a way to exploit it.

because you need to be able to run homebrew to do that which 1.51 can't......

Refer to previous statement.

F9zDark · Post by **F9zDark** » Mon Jul 04, 2005 10:49 am

OK. I have said this once already....

Read the damned thread I linked to in my last post. It outlines just about every damn thing you guys are proposing here, save checksum alterations(if its possible I know not how to do it).

I tried the mix and match of SFO and Upgrade data, between 1.50 JP update, 1.51 US, and 1.52 US and JP updates. It doesn't work. The DATA.PSP probably contains a quick checking program that reads the flash and then reads the file's version # or check-sum or what have you.

The ONLY way to downgrade is get a job at Sony and(most certainly, illegally) write a downgrade program. Unless anyone of you know how to get the AES key and/or signature and code your own downgrade, I am afraid we wont be downgrading anytime soon...

HaredX · Post by **HaredX** » Mon Jul 04, 2005 11:06 am

Nick Fury wrote: True but making it work by way of a downgrade might be the answer.

If we could run homebrew on a 1.51 to downgrade, then we wouldn't need to downgrade to run homebrew, thats what I am saying, you proved my point more, the easiest way to run homebrew isnt to make homebrew that downgrades because by being able to run homebrew that downgrades the psp we have already accomplished it...

HaredX · Post by **HaredX** » Mon Jul 04, 2005 11:08 am

F9zDark wrote:Unless anyone of you know how to get the AES key and/or signature and code your own downgrade, I am afraid we wont be downgrading anytime soon...

Not true at all, I think that as soon as we find a way to access and write to the memory where the psp's system files are we can just copy and paste files from a earlier firmware dump into that directory

F9zDark · Post by **F9zDark** » Mon Jul 04, 2005 11:13 am

We can do that now, and rumor has it, last person who did that bricked their PSP.

Once again, we're back to square one...

DrKickflip13 · Post by **DrKickflip13** » Mon Jul 04, 2005 1:23 pm

well they woudnt have made a 1.52 update if the 1.51 wasnt flawed...

F9zDark · Post by **F9zDark** » Mon Jul 04, 2005 2:03 pm

DrKickflip13 wrote:well they woudnt have made a 1.52 update if the 1.51 wasnt flawed...

Exactly. And that is out best bet, searching for holes.

Thanhda · Post by **Thanhda** » Mon Jul 04, 2005 2:43 pm

F9zDark wrote:
DrKickflip13 wrote:well they woudnt have made a 1.52 update if the 1.51 wasnt flawed...
Exactly. And that is out best bet, searching for holes.

well there might have been a flaw in a different area, not nessary in the booting stage. it could have been network bug, or something else causing the psp to crash or something.

HaredX · Post by **HaredX** » Mon Jul 04, 2005 5:52 pm

either way, there is always a way to crack something

AuDioFreaK39 · Post by **AuDioFreaK39** » Mon Jul 04, 2005 8:47 pm

I heard an idea on the pspupdates forums about creating a php functioned webpage that will allow you to view the file structure and system files in the psp. You would need to do this in the Wipeout web browser, but then again, just another thought.

Nick Fury · Post by **Nick Fury** » Tue Jul 05, 2005 12:06 am

HaredX wrote:If we could run homebrew on a 1.51 to downgrade, then we wouldn't need to downgrade to run homebrew, thats what I am saying, you proved my point more, the easiest way to run homebrew isnt to make homebrew that downgrades because by being able to run homebrew that downgrades the psp we have already accomplished it...

I didn't prove jack shit for you. Instead there was a misunderstanding by way of communication.

You seem to think that we need the ability to run homebrew applications on the PSP to downgrade the firmware. That's not necessarily the case as pointed out by other users in this very thread.

Don't assume that the downgrade will come by way of running homebrew. It could come by other means.

Advancements in 1.51...

jew