I just got report from anther case:
MT1300 tethering iphone8, everything seems correct, but no Internet.
But the user tried repeater to iphone and it worked. When change back to USB tethering, it suddenly worked.
So I really have no idea.
@alzhao I have this same model, tethered to iPhone 8, everything seems correct, but no internet. So same thing. I have updated the firmware to the latest snapshot, and it still does not work. Should I proceed with configuring it as repeater and then see if USB tethering works afterwards? is there a way to pull some logs before I do it?
You can either use repeater, or upgrade your ios. Not sure upgrading ios works because some test indicate this related to the carrier as well.