Universal PSP Unbricker and Downgrader - Pandora's Battery

Those crazy crackers are at it again with Pandora's Battery: the universal PSP unbricker.

Dark Alex wrote:

Yeah, the "Service Mode".

This has been the work of the alliance of a lot of developers externally known as "C+D": Nem, joek, Fanjita, Chris, jim, psp250, ditlew, Skylark, Dark_AleX (Me), mathieulh, tyranid, adrahil and Booster.

The battery lets to downgrade any firmware version (including those that Sony releases in the future), and to unbrick bricked psp's (whatever bricked by software psp, not only the ones bricked by that retard of Serafin), in all current hardware. Of course, we cannot be sure about future hardware, but the Firmware Update game has finally come to the end for all current psp's.

http://forums.maxconsole.net/showthread.php?t=75759

A universal PSP unbricker/downgrader by the Prometheus project, also
known as Team C+D.

REQUIREMENTS
- A spare PSP Battery. Any make will do. Using a spare is best, as it
  will not be possible to boot the PSP in its normal state with the
  modified battery.
- A spare Memory Stick Pro Duo of less than 4Gb. (256Mb should be
  enough for all applications).
- A PSP with a Custom Firmware such as OE, M33 or WC, or a PSP with
  the 1.5 original kernel.

INSTALLATION PROCEDURE
- Connect the PSP to the PC with the Memory Stick inside via the USB
  Connection.
- Format the Memory Stick using any utility.
- Use mspformat to format the Memory Stick logically.
- Remove the Memory Stick and disable the USB connection.
- Connect the Memory Stick again via the USB connection of the PSP.
- Manually create the PSP/GAME (optionally PSP/GAME150) folders on the
  Memory Stick.
- Copy the "battery" and "installer" programs to the PSP/GAME
  (optionally PSP/GAME150) folder.
- Copy the 1.50 official updater as UPDATE.PBP to the root of the
  Memory Stick.
- Remove the Memory Stick and disable the USB connection.
- Run "installer" through the firmware on the PSP. This application
  will create the firmware files on the root of the Memory Stick, as
  well as msipl.bin.
- Connect the Memory Stick again via the USB connection of the PSP. 
- Execute "msipl" application on the PC with the msipl.bin to write
  the IPL to memory stick.
- Remove the Memory Stick and disable the USB connection.
- Execute "battery" application on the PSP to modify the battery.
- Congratulation, you are now in posession of a "Magic Memory Stick"
  and a "JigKick Battery".

USAGE
- Insert Memory Stick into the PSP
- Remove power cord and insert the JigKick Battery into the PSP.
- A menu appears when the PSP boots. Follow the onscreen information
  and instructions.

NOTES AND RESTRICTIONS
- The firmware in the Memory Stick is not a full 1.50, but a minimal
  subset. Therefore, not all applications (such as flashers, or
  recovery apps) will load.
- Only Memory Stick Pro Duo are compatible. Memory Stick Duo
  (e.g. 32MB sticks) are not supported.
- The IDStorage cannot be totally restored, as there is no known way
  to regenerate it properly.
- It is strongly RECOMMENDED to make a flash dump of the PSP before
  any downgrading operation.
- There might be a BSOD at the end of the downgrade. This is normal,
  and happens on the standard downgraders.
- All hardware revisions known at this day are supported. 
- This release contains no Sony-copyrighted material.  All required
  Sony data is generated from the v1.50 update files.

CREDITS
- Please do not edit or remove these credits... ;)
- All work done by the Prometheus team aka Team C+D:

  Adrahil (VoidPointer)
  Booster
  Cswindle (Caretaker)
  Dark_AleX (Malyot)
  Ditlew
  Fanjita (FullerMonty)
  Joek2100 (CosmicOverSoul)
  Jim
  Mathieulh (WiseFellow)
  Nem (h1ckeyph0rce)
  Psp250
  Skylark
  TyRaNiD (bockscar)

- With thanks to everyone who has contributed to the PSPSDK, without which
  nothing would have been possible.

http://www.noobz.eu/joomla/news/pandoras-battery.html/
Pandora.zip

If anyones thinking of doing this make sure and have a gander at the thread linked above, the requirements and the readme. I might use this as a downgrader for a friends PSP at 2.81 firmware with a broken UMD drive. But be wary using this as a downgrader!. I haven't used this yet.

Theres a lot of shíte about this not working on Vista as well so make sure you have a look through the thread linked above for responses on that matter. I dont know about Linux.

Supposedly you can turn the battery and card back into normal operations but again you will need a seperate PSP for that.

The PSP slim comes out soon, lets all hope its not patched in the meantime, because if its not, you could use this to install custom firmware on it. Sweet.

Bargain Alert:
Also, be on the lookout for cheap ass "Bricked" PSP's on Ebay. They wont be selling there soon and you could swoop one quick, fix it (with the help of your own PSP!) and sell it or do whatever you want with it.