rbk50 firmware update problem

I recently contacted support about my Orbi system dropping it's connection frequently.  I have a RBK 50 router with one RBK 50 satellite and one RBK20 satellite.  They told me to do a factory reset and then update my firmware.  They gave me a link to a page with a long set of instructions requiring connecting to the router with a computer with an Ethernet cable.  First, it seems like there should be a way to more easily update firmware within the app.  Is this not available.  Second, my laptop is a newer computer with no ethernet port.  How can I connect to the router directly if I don't have an ethernet port?  Do you have to go through this everytime they update firmware?

Thanks to anyone with suggestions