Just download and install i OS 8 on your device with the detailed i Mobie Guide.
Check How to Update to i OS 8 Over the Air or Via i Tunes Once the i OS 8 is installed on your i Phone, i Pad, i Pod touch successfully, most of you think the whole process is finished.
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If you are working with an i OS device which is i Phone 5 latter, i Pad 4/i Pad mini 2 latter or i Pod touch 6, it not only supports i OS 8, and it also can be upgraded to i OS 10 and current i OS 10.3.
Restoring your i Pod erases all of its data and settings and returns it to the state it was in when you first got it.
After it's been restored, then you can update the operating system.
Here check full guide to make a smooth upgrade to i OS 10 With i OS 8 has just arrived, you may feel excited to update your Apple devices to i OS 8.
Upgrading to i OS 8 is pretty simple, you just need to click Update on i Tunes or Install Now on an i OS device.