RBR20 satellite firmware question

I have an Orbi rbr10 with 2 satellites. One of my satellites has a flashing red light and will not connect to the router. It seems like a firmware update was pushed correctly to the router and one satellite, but the 2nd satellite still has an older firmware version, and will not connect. Is there any way to get the firmware update on the third satellite? There is no external connection to get it plugged up to a computer..