Iphone usb tether to car stereo unit
I just had a Sony XAV-AX6000 installed in my car. I'm trying to update the firmware but the Sony system can't read the download onn a USB drive. I've tried different sized USB drives and even reformatted the drive, but no luck. The other option to update the firmware is by USB tethering my iPhone to the unit. I can't figure out how to do that. Does anyone know?
iPhone 5s, iOS 11