I used the D_A method and it works =)
"He just released a new decrypter which decrypts the DATA.PSP of the new MotoGP demo. We'll list the instructions here:
* With some pbp utility, such as pbp unpacker, extract the files from the
MotoGP demo pbp. Put the extracted file DATA.PSP in the root of
* Run the decrypter test with 1.50 kernel (GAME150 folder) if you are in 2.71
SE-A or in devhook emulating 1.50 if you are in HEN.
The decrypter test will output a file called "DATA_OUT.PSP" in the root of memory stick. Using this file as the DATA.PSP, rebuild the pbp. Change the text in the SFO "2.80" with some hexadecimal editor to something <= 2.71."
Thanks to Dark_Alex