Hi, Pinkydo.
Thank you for visiting Apple Support Communities.
I understand you are receiving and error 3004 on restore and have already reset your host file with the issue persisting. There are just a couple more steps that I could recommend going through.
If you have TCP/IP filtering, firewall, or security software installed on your computer, follow these steps.
- Follow these steps to configure or temporarily uninstall your security software.
- Bypass your Internet router. Some routers might block iTunes from accessing the update server. If you're using a router that isn't manufactured by Apple, try these steps.
- Disconnect from your wired or wireless router.
- Use an Ethernet cable to connect directly to your modem.
- Restart your computer and modem. Contact your Internet service provider for instructions on using your modem.
- Be sure you have a working Internet connection by visiting www.apple.com. See these steps for help or contact your Internet service provider.
- If your Internet connection is working, try to update or restore your iOS device again.
Try to restore or update on another computer with a different Internet connection. This will help rule out other issues on your computer that might stop iTunes from communicating with the update server.
Errors 1639, 3000-3020, and 3100-3999 (with the exception of 3194) are sometimes caused by your network settings. If your computer uses a managed network, refer to your network administrator. Proxies, firewalls, and other network security measures can cause these errors. If necessary, find a different network connection to restore the device. For example, if you're restoring at work, try to restore at home or on a friend's computer and network.
Error 3194, Error 17, or "This device isn't eligible for the requested build"
http://support.apple.com/kb/ts4451
Cheers,
Jason H.
