Chosen Solution
Last Nov 2017 I tried upgrading my IPhone 6 to IOS 11.0 and it struck in the reboot cycle. I’m trying to troubleshoot it now. When I went to apple store they said its dead and it giving “4005” error. They have asked me to pay $300 to trade in for another IPhone 6. I’m sure there should be a way to fix this. please help.
Take it to a phone repair shop to get them to fix it or use a windows computer with 3utools or iTunes installed to restore / update the phone. Apple has a good guide on how to go about this: https://support.apple.com/en-au/ht201412
