On August 22 2007, Team C+D released the "Pandora's Battery" which was the Prometheus Project everyone was waiting for. It converted a spare Memory Stick Pro Duo and battery into a "Magic Memory Stick" and "JigKick Battery". Some People mistake Pandora's Battery for the Jigkick Battery, but Pandora's battery is both the Magic Memory Stick and the JigKick Battery. The Memory Stick and battery can then be used to downgrade any PSP of any version or to recover from a brick. To convert the Memory Stick and battery another PSP which is able to run 1.50 homebrew is needed. The Memory Stick can also be converted without using a homebrew PSP by using a Pandora's battery program, such as Pandora Easy GUI. After the downgrade/unbrick service has been completed, the Memory Stick and battery can be restored for normal usage.
This is a battery with its serial changed to 0xFFFFFFFF. When a psp's battery serial number is changed to 0xFFFFFFFF the PSP boots the ipl from sector 16 on the physical drive (the Magic Memory Stick). This unlocks the service mode of the PSP and launches the IPL from the Memory Stick (instead of from flash0). You can either Hardmod a battery or Softmod it.
Hardmod is when you you make a JigKick Battery by opening it up and and removing a pin, this can be done to any battery.
Softmod is when you make a JigKick Battery by using a program. But it has to be suitable. New Batteries cannot be softmodded.
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A Magic Memory Stick refers to any memory stick that has been converted to boot, and work with a JigKick Battery. Depending on the method of creation, a Magic Memory Stick can either downgrade or boot PSPs to 1.50 FW (Phat), upgrade any PSP to 3.71/3.80 M33, and their counterparts, or be able to launch various homebrew. But it has to be suitable. The Memory sticks can be made into Magic Memory Sticks only if they are Pro Duo, and below 4GB.