When I am trying to update my iPad 2 to 5.1 using Wifi it says the update size is 206mb. But when I am trying to do that same thing by attaching it with my PC(itunes) the update size is ~767mb.
Why is this difference in size?
ipad
When I am trying to update my iPad 2 to 5.1 using Wifi it says the update size is 206mb. But when I am trying to do that same thing by attaching it with my PC(itunes) the update size is ~767mb.
Why is this difference in size?
Best Answer
It sounds like you're talking about the difference between an "Over The Air" (OTA) update, also called a delta update, done by tapping a button in the device's Settings - and a normal update done by clicking "Update" in iTunes on your computer.
OTA updates are smaller because they only include the new assets (code, images, etc.) from the update, instead of replacing all the assets on the device.
This article includes an example of this difference on an iPhone 4: