Requeriments and Install : - Installation requires a PSP with 4.01 M33 or higher CFW (Only v1 and v2 motherboard users.) Offical sony firmwares And PSP3000 and PSP2000 v3 motherboards are not supported. - Battery 78% loaded, - Extract the file you have downloaded anywhere on your computer. - Connect your PSP to your computer using the USB cable. - Copy the "UPDATE" folder into /PSP/GAME - Copy the "550.PBP" file into main menu (memory stick first page) - Exit USB Mode And run the "5.50 GEN-D3" - Press "X" for Enter - Select "Flash Install CFW 5.50 GEN-D3" and Press "X". Start install.. please wait. - When installation is completed press the "X" button to restart automatically.. done.. - Look at the version - 5.50 GEN-D3 - Then you can erase "550.PBP" file and "UPDATE" folder. - PSP 2000 v3 mainboard and PSP 3000 users, install 5.03 GEN-C.. Search the forums..I haven't tested.. Because i don't have PSP 2000 v3 mainboard or PSP 3000.. sorry..