Failed to connect to iXpand Drive iPhone 7 IOS 11.1

there are other posts here that show this is an iOS 11 issue that only occurs after resetting an iOS 11 device. The only thing that has worked for some users is to do a full restore using iTunes (not back up then restore) this has had mixed results but you may want to try it and see if it will work for you. If not it seems you may have to wait until the fix comes from apple.