new 2.6 Donwgrader?

stop trying please
when
no if it happens you will know
it will be big big news
stop asking
this forum is for if you have ideas or help to give!

I have. Seems too random. I could have thought of that. I pretty much know as much as possible about the PSP without being a coder. My idea for a downgrader is this:

You know how iR Shell lets you do a "system pause" when playing a UMD game or homebrew by pressing L+SELECT while in-game? Remember that. Now think about this: The PSP will not boot updates that are modified. The keyword there? Boot. You would need two memory sticks or a memory stick reader for your computer. You would also need a copy of the 2.70 update and a copy of the 2.70 update with the DATA.PSAR from the 1.50 update. Run a program like iR Shell. Through that, run the 2.70 update. When you get to the "Do not remove mem stick blah blah blah" screen, do a system pause (because the update detects when the Memory Stick is removed if it is free to detect. But if it is frozen by a program (iR Shell), it will not.) Insert a memory stick with the 2.70 update that has the DATA.PSAR from the 1.50 update AND iR Shell. Unfreeze the PSP. The screen will be where it was left, but now, the PSP will continue reading from ms0:\PSP\GAME\UPDATE\EBOOT.PBP\DATA.PSAR, which is the 1.50 update file. The PSP will think it is installing 2.70, but is reading from DATA.PSAR of 1.50, and installing 1.50 files. The PSP will perform a checksum of the files at the end of the update and detect that they are not 2.70 files. It will give an error, ask to reset settings (because they contain setting data from the version you were at for features not available in 1.50), and be downgraded.

The only problem is that PSPs that need downgraded cannot run homebrew (iR Shell), and if you can run homebrew, there is no reason to downgrade. Just a logic issue I thought I would bring up.

thats actually a pretty good idea. I am sure there is some application that could be made for eloader that would work.(maybe not)

Quote:

---

Originally Posted by IndianCheese

I have. Seems too random. I could have thought of that. I pretty much know as much as possible about the PSP without being a coder. My idea for a downgrader is this:

You know how iR Shell lets you do a "system pause" when playing a UMD game or homebrew by pressing L+SELECT while in-game? Remember that. Now think about this: The PSP will not boot updates that are modified. The keyword there? Boot. You would need two memory sticks or a memory stick reader for your computer. You would also need a copy of the 2.70 update and a copy of the 2.70 update with the DATA.PSAR from the 1.50 update. Run a program like iR Shell. Through that, run the 2.70 update. When you get to the "Do not remove mem stick blah blah blah" screen, do a system pause (because the update detects when the Memory Stick is removed if it is free to detect. But if it is frozen by a program (iR Shell), it will not.) Insert a memory stick with the 2.70 update that has the DATA.PSAR from the 1.50 update AND iR Shell. Unfreeze the PSP. The screen will be where it was left, but now, the PSP will continue reading from ms0:\PSP\GAME\UPDATE\EBOOT.PBP\DATA.PSAR, which is the 1.50 update file. The PSP will think it is installing 2.70, but is reading from DATA.PSAR of 1.50, and installing 1.50 files. The PSP will perform a checksum of the files at the end of the update and detect that they are not 2.70 files. It will give an error, ask to reset settings (because they contain setting data from the version you were at for features not available in 1.50), and be downgraded.

The only problem is that PSPs that need downgraded cannot run homebrew (iR Shell), and if you can run homebrew, there is no reason to downgrade. Just a logic issue I thought I would bring up.

---

Well, personally I wouldn't mind being back on firmware 1.5, since with apps like UMDLoader you can play all the newer games. Can someone test this?

Quote:

---

Originally Posted by IndianCheese

I have. Seems too random. I could have thought of that. I pretty much know as much as possible about the PSP without being a coder. My idea for a downgrader is this:

You know how iR Shell lets you do a "system pause" when playing a UMD game or homebrew by pressing L+SELECT while in-game? Remember that. Now think about this: The PSP will not boot updates that are modified. The keyword there? Boot. You would need two memory sticks or a memory stick reader for your computer. You would also need a copy of the 2.70 update and a copy of the 2.70 update with the DATA.PSAR from the 1.50 update. Run a program like iR Shell. Through that, run the 2.70 update. When you get to the "Do not remove mem stick blah blah blah" screen, do a system pause (because the update detects when the Memory Stick is removed if it is free to detect. But if it is frozen by a program (iR Shell), it will not.) Insert a memory stick with the 2.70 update that has the DATA.PSAR from the 1.50 update AND iR Shell. Unfreeze the PSP. The screen will be where it was left, but now, the PSP will continue reading from ms0:\PSP\GAME\UPDATE\EBOOT.PBP\DATA.PSAR, which is the 1.50 update file. The PSP will think it is installing 2.70, but is reading from DATA.PSAR of 1.50, and installing 1.50 files. The PSP will perform a checksum of the files at the end of the update and detect that they are not 2.70 files. It will give an error, ask to reset settings (because they contain setting data from the version you were at for features not available in 1.50), and be downgraded.

The only problem is that PSPs that need downgraded cannot run homebrew (iR Shell), and if you can run homebrew, there is no reason to downgrade. Just a logic issue I thought I would bring up.

---

That is quite an idea, but it seems risky. It sounds like there might be a possible risk of screwing up the PSP software.

2 major problems with your theory.

1. the firmware updates probably have a different code they download from so it would probably just kill your psp when you press pause and put in the one with 1.5-brick'd

2. any psp v2.XX or higher does not allow anything to access it's flash drive basically you would not be able to update from a program without the proper sony authorization.

Great idea. Can IRshell work on v2.6 psp's though?

Has anybody tried changing the version on a 2.xx psp to 1.0 then running a 1.5 update?

Quote:

---

Originally Posted by NoQuarter

Has anybody tried changing the version on a 2.xx psp to 1.0 then running a 1.5 update?

---

-_- if there isn't a downgrader to 1.5, what makes you think there is one for 1.0?

Inu268

what he means is use a program like pspsetx to change your version number to 1.0(just change the number not the actual firmware, duh) and than run the update for 1.5 as normal

im am on 1.5 so i dont know if PSPsetX works on 2.6 if that method works I have no idea if no one has thought of it till now

it will probably bbrick it though, when downgrading 2.0 it bugs at the end because of the files, the higher the version number the more files, so i guess the bigger the bug, and then dead psp

IRshell does not work above 1.5 it uses prx files kernal only