Reports of the first fully open custom BIOS firmware replacement for the PSP has been announced. The so-called Epsilon BIOS supposedly has cracked the PSP encryption methods to allow homebrew and unsigned code full access to the PSP, including running in kernal mode. Firmware revisions up to the latest 2.71 release are supported with this BIOS, and UMD .ISO booting from memory stick is included. The BIOS itself requires an original PSP firmware to operate, so the new release will work only in conjunction with the recently announced Undiluted Platinum modchip. This BIOS, plus the new modchip should allow all homebrew developers full access to the PSP hardware and firmware feature set.

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