Iphone ios 8 help. The iphone could not be restored the device can't be found?

Basically i tried to update to ios8 it extracts the software for nearly 1 hour and then at the end it says the iphone could not be restored. The device can't be found.

things i have tried but haven't worked
- i have updated to the latest itunes
- reset itunes and computer

I'm android user and i can't help you with this

Did you register your device's UDID with a developer account? Use a site like http://www.udid.in/ to get it activated.

Contact Apple support.

https://www.apple.com/...t/contact/

1. Click Get Started
2. Select device
3. Select option (Service Requests & Troubleshooting)
4. Select option (Restore or update not working as expected)
5. Enter phone\email (optional)
6. Click Chat or Schedule a Call (recommend chat)
7. Enter Serial Number (it gives you options on how to get it)