First you need to dump your EID Root Key (
You must login or register to view this content.) which must be done on 3.55 cfw downgrade using the 999 pup if needed. Install and run the eEID_RKDumper.pkg, the PS3 will just show a black screen and beep several times. You can now restart the PS3 and retrieve your eid_root_key from /dev_hdd0/tmp/