These errors all mean the same thing: iTunes can't connect to Apple's servers. The restore or update process requires server verification, and something is blocking that connection.

Good news — these are almost never hardware problems. They're network/software issues that you can fix yourself.

The errors and what triggers them

Error 17 / 1638: General Apple server connection failure. Firewall, DNS, or internet outage.
Error 3000: No internet connection detected at all.
Error 3004: Firewall or proxy is specifically blocking Apple's update servers (gs.apple.com, albert.apple.com).
Error 3014: Apple's server is overloaded — common right after a new iOS release when millions try to update simultaneously.
Error 3200: The firmware file (IPSW) didn't download completely due to a network interruption.

How to fix all of them

1

Check your internet connection

Open a browser and try loading apple.com. If it doesn't load, fix your internet first. Restart your router/modem. Try a wired Ethernet connection instead of Wi-Fi.

2

Disable firewall and antivirus temporarily

Security software often blocks iTunes from connecting to Apple. Disable it, try the restore, then re-enable it afterward.

3

Change your DNS to Google (8.8.8.8)

Your ISP's DNS server might be blocking or failing to resolve Apple's servers. Switching to Google DNS (8.8.8.8 / 8.8.4.4) or Cloudflare (1.1.1.1) can bypass this.

4

Check your hosts file

If you've ever used jailbreak tools, they may have redirected Apple's server in your hosts file. Open it and delete any line containing gs.apple.com.

5

For Error 3014 — just wait

If a new iOS was just released, Apple's servers get slammed. Wait a few hours and try again.

6

For Error 3200 — delete IPSW and re-download

The firmware file is incomplete. Delete it and let iTunes download a fresh copy. Make sure your connection is stable during the download.

If you've tried everything above and the error keeps coming back, the problem is most likely physical — something broken inside the device that software can't fix. That's when it needs professional hands-on inspection.