There are only 2 configs for BA's 77Ws: refurb'd (
77H) and not-refurb'd-yet (
77G). It's pretty much a coin toss which one will show up for SFO and it's subject to change right down to the wire until the 77Ws are fully refreshed: as of today there are 8 refurb'd (or delivered as) 77H config frames in service, 5 77Gs in service, and 3 Shrödinger's Craft frames in Cardiff where us forum denizens are assuming they're somewhere between 77G and 77H but we'll only find out when they leave CWL and the waveform collapses.