iPhone 7 tethering issue with GL-AR750S-EXT

[wcs2228]

More info here that may be relevant (?):

USB Tethering broken in IOS 14 (Fixed Nov 26 2020)

iOS and iPadOS 14 break the USB tethering on GL.iNet routers. If you use iPhone USB tethering to the router, please do not upgrade to the iOS14 or iPadOS 14. If you have already upgraded, you may use wifi hotspot for now. We do not have a fix for USB tethering right now. We are seeking various ways to fix this but do not have update until now.