its one of those secret option parameters we're not allowed to talk about.
did you enter the option parameters 9100 to 9131 through the IPL?
If not follow this procedure.....
Fanuc 10 Fanuc 11 Memory Backup Procedures
If you're missing G54 you're probably missing a lot of other stuff that is there as standard.
For example G96 is an option but standard. Even the control panel and manual pulse generator are options.
Do you have separate tool wear offsets and geometry offsets? that's another option parameter but is standard on T series.
also FAPT has its own set of parameters. you can make it output G50's or it can use geometry offsets (no G50 output).
And many other things.