Run the Bootdisk Utility as Administrator and select your USB
Make sure Format your USB in " FAT32 "
Once you done Click on " Options"
Make sure choose this
1:- Boot data set=Built in only
2:- Boot record=CLOVER
And hit " OK "
& hit Format Disk
Wait for completion
1:-You can also add kext in USB. Simply copy your desire kext to
if there is no folder like 10.7 & 10.8 then make it and copy your kext there
2:-Add you DSDT.aml to /USB/EFI/ACPI/patched