No idea what it does as I have not bothered with the last few upgrades from the TM support site & I clear everything on 3.1 east with my TM5302HD & TM5502HD ???
I thought the embedded keys were on the TM5402HD M3.? beware of the latest key files some are issuing as they have made the key file on the M3 & it will wipe out all of your stored Biss keys on M3 & F3/5 Best to make your own key file these days