This downgrade is for the firmware version 1.50 or OE o M33, which they can execute homebrew. Only for this version, no for SONY firmware....
Read the readme... :
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.
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Regards!