Guys im going to install Mountain Lion with iAtkos ML3U. But befoore that, i need to patch the bios and flash the bios with the modified bios file. im using an Asus P8H77 V-Le mobo. The flashing with the original bios was succesfull. But i cant flash it with a modified bios. The lastest version of the bios is 1103. So, i patched the bios with PMPatch tool, and the modded bios file was generated. the only problem im facing is that , i cant flash this modded bios in both, ASUS EZ FLASH 2 UTILITY and DOS Mode(crashfree). Whenever i try to flash, i get a message that tells something about the "Security check failed". im stuck in here. So please help me asap !

BTW, the bios vendor is American Megatrends INC.