Ah - I just found this:
“Running firmware requires 0x180 as Open AT application start address, but application to be downloaded was linked at 0x260000”
viewtopic.php?f=108&t=6257&hilit=0x260000
I didn’t find it before because I searched on “0x80” 
So it seems that it’s not just FW 7.47 that’s affected…