maybe this could help somehow, or some people trying to change their mac address(which they shouldn't) because it doesn't work.
things ive tried,
-removed modded rpf file
-changing mac address
-changing cid
-changing psid
-changing ip from ps3
-removeing cfw syscall
-reinstalling the game
-used disc version
-reinstall the update's
-used normal eboot
-making an account on ofw and then tried it on my cfw
-and a lot more i cant think of atm
all these methods ive tried failed, i get instant banned from R* lol
i hope this will help some people.
-Enjoy