Download the Pandora Battery v1 package and Update 1.50.The Battery and Memory Stick can only be prepared on a fat PSP, and not yet on a Slim. It requires a spare PSP Battery and a Memory Stick Pro Duo 512 MB or larger card. This works for all fat PSPs and slim PSP with version 3.60. It enables a service mode that will allow writing to the flash, and thus allow for homebrew to be enabled. Pandora is now the universal downgrade method for almost every PSP. The PSP will now be flashed to M33 3.52.Again from the Memory Stick menu, launch 3.52 M33UPDATE this time.It will exit back into the menu after it's finished writing the new files. From the Memory Stick menu, launch the 3.52 M33 CREATOR application.Copy the M33CREATOR folder to the /PSP/GAME directory.Download the official 1.50 and 3.52 PSP firmware and rename them to 150.PBP and 352.PBP respectively, put them in the M33CREATOR folder.Go to the Memory Stick PSP menu and run the KXploit Patcher to not require the spesial %-folder to launch an application.
Put kxploitpatcher and kxploitpatcher& into the /PSP/GAME/ folder.The PSP is now running 1.50 and able to execute all homebrew applications located in the Memory Stick directly.At the first startup a message about corrupted config will be displayed, press O.Leave it alone for a few minutes untill it asks you to reboot. This means the flashing proceedure is running. The screen will be black but the Memory Stick light will flash.Wait for the eLoader menu system to load and execut the Downdater Final Auto from the list.Install the eLoader files into /PSP/GAME/.Download eLoader 0.9.9.5 or newer zip or installer.Normally done using Downhelper on a 1.50 machine, but since that's hard to find another PSP with 1.50 get that rar archive. It contains the already extracted 1.50 firmware files needed. Put DOWNDATER FINAL AUTO EBOOT in the /PSP/GAME/ folder on the Memory Stick.Download Downdater Auto Final for 2.50/2.60.
From that point it's possible to upgrade to a new custom made hacked firmware, in this case the latest M33 3.52 firmware. This method is using the Grand Theft Auto Libery City Stories exploit to execute the 2.60 to 1.50 downgrader. There are different kinds of exploits depending on what firmware version you are going from. To enable homebrew you have to downgrade from the official firmware using some kind of an exploit.
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