Once the update is installing itself, you need to let it finish because trying to intervene mid-update is a recipe for making the i Phone, i Pad, or i Pod touch useless and require a full restore.Some versions of i OS can be downgraded after the fact, so that would be the next approach if you accidentally installed an update you didn’t want, you can learn more about downgrading system software here.

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If you want to keep i Tunes from checking for the same i OS update you just stopped, you need to ignore the update.

The easiest way to do that is when the pop-up appears in i Tunes, choose the “Do not ask me again” option checkbox and do not choose to download or install it.

This was due to accounting rules making the device not a "subscription device" like i Phone or Apple TV, and significant enhancements to the device required payments.

However, in September 2009, a change in accounting rules won tentative approval, significantly affecting both Apple's earnings and stock price, and allowing i Pod Touch updates to be delivered for free.

The process can be repeated the next time an update is accidentally starting to download, but it always requires quick action.

You must move quick because some software updates are quite small and with a fast internet connection the i OS update will quickly download and start trying to install.

To avoid any potential lawsuit, Apple licensed the "IOS" trademark from Cisco.

Originally, i Pod Touch users had to pay for system software updates.

Apple has been significantly praised for incorporating thorough accessibility functions into i OS, enabling users with vision and hearing disabilities to properly use its products. The current version, i OS 11, was released on September 19, 2017.

It is available for all i OS devices with 64-bit processors; the i Phone 5S and later i Phone models, the i Pad (2017), the i Pad Air and later i Pad Air models, all i Pad Pro models, the i Pad Mini 2 and later i Pad Mini models, and the sixth-generation i Pod Touch.

In June 2010, Apple rebranded i Phone OS as "i OS".