I believe it's done through software updating on the 777 - you need to ask your Boeing field rep for help on this one as I think you will need to produce a new disk.
It will consist of a modified OPC (Operation Program Config) which needs to be loaded into the AIMS CPMs (Core Processor Modules).
This is a kind of software pin programming, you'll need to see the field rep as they have access to the specific software to produce a new OPC.