I have been through the forums and have tried everybodys tips on how to install 1.50 kernel add-on and I can't seem to get it to work. I placed the add-on2 files in the PSP/GAME/UPDATE folder and the 150.PBP renamed from the EBOOT.PBP file from the first 1.50 add-on in the root folder with all the other files in the extracted file. When I execute the file, I get an error say incorrect or inconsistent 150.PBP file and then it quits. Need some guidance. When I go through the recovery menu for M33 and look at the configuration, I can change between 3.71 and 1.50. What exactly is the 1.50 add-on?