How to Resolve “This device isn’t eligible for the requested build” Error While Updating To iOS 5.0.1

Apple has recently released iOS 5.0.1 [Direct Links] for iPhone 4S, iPhone 4, 3GS, iPod Touch And iPad devices to resolve   battery drain issues. I am sure some of you guys have been already upgraded iOS 5.0.1 whereas others facing “This device isn’t eligible for the requested build” errors while updating their devices.

You will actually get this error when restore process reaches to a stage where iTunes verifies your device. In order to do that iTunes connects to the Apple server and match your device ID to make sure if your device is eligible to be restored. You can resolve this problem by delete a line of code “74.208.151.171 gs.apple.com” present in hosts file.

Thanks to iPhonejailbreak for below mentioned step by step guide, varies depending upon operating system which is being used to restore your device.

Apple OS X Lion

1. Open Terminal
2. Copy and paste the following code into Terminal
   sudo nano /private/etc/hosts

3. Press Enter.
4. Remove 74.208.151.171 gs.apple.com or add ‘#’ in front of this line (commenting).
5. Save by pressing Command+S, click Save.

Apple OS X Snow Leopard & Leopard

1. Open Terminal (Click Spotlight, or press Command+Space. Now type terminal.)
2. Copy and paste the following code into Terminal
   sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts
3. Press Enter.
4. Remove 74.208.151.171 gs.apple.com or add ‘#’ in front of this line (commenting).
5. Save by pressing Command+S, click Save.

Apple OSX 10.4.X Tiger

1. Open Terminal (Click Spotlight, or press Command+Space. Now type terminal.)
2. In Terminal type, ‘sudo pico /etc/hosts‘, press Enter.
3. Remove 74.208.151.171 gs.apple.com or add ‘#’ in front of this line (commenting).
4. Press Ctrl+X, then Y to save.
5. Type ’sudo niload -v -m hosts . < /etc/hosts’, press Enter
6. Type ‘lookupd -flushcache’, press Enter.

Microsoft Windows 7 / Vista

1. Click Start -> All Programs -> Accessories.
2. Right click “Notepad” and select “Run as administrator”
3. Click Yes on the UAC prompt.
4. Click File -> Open.
5. Change the file filter drop down box from “Text Documents (*.txt)” to “All Files (*.*)”.
6. Browse to “C:\Windows\System32\Drivers\etc”.
7. Select “hosts” and click “Open”.
8. Remove 74.208.151.171 gs.apple.com or add ‘#’ in front of this line (commenting).
9. Close Notepad. Click Save when prompted.

Microsoft XP/2003/2000

1. Browse to Start > Programs > Accessories > Notepad.
2. Click File > Open.
3. Browse to “C:\Windows\System32\Drivers\etc”.
4. Select “All Files (*.*)” from the Files of Type drop-down menu.
5. Select “hosts” and click “Open”.
6. Remove 74.208.151.171 gs.apple.com or add ‘#’ in front of this line (commenting).
7. Close Notepad.  Save when prompted.

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