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... :
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To run the software
Pandora Battery(unbricker memory stick image and to convert a standard PSP battery into a jigkick battery ), after you have done that you can use it downgrade on any psp with any firmware.
Please be nice we all been noobz haven't we