The 15-1994 and 15-2116 cannot be upgraded over the phone. They can only be upgraded by JP1 cable. I don't believe RS customer support will do that, so you'd need to get your own JP1 cable to install upgrades (about $15).

Rob included data some about SAT/1377 in one of the JP1 group's files, so I'm pretty sure there is enough data available to construct the full upgrade for it with the free JP1 software. The data Rob posted indicates that none of the models of OFA or RS remotes in his list include that setup code built-in, so any of those models would need the upgrade.

I'm both posting this reply and emailing it.