If you are asked to upgrade to newer version of i OS, click "Cancel"."Reset".
So to restore a jailbroken i Phone without updating, you may want to unjailbreak the i Phone first with the tweak Cydia Eraser, which can remove all traces of Cydia to unjailbreak your device.
After you have restored the i Phone, you can have the phone jailbroken again. Now you have factory reset an i Phone/i Pad without updating.
It's inevitable that some products and platforms will end up on the wayside after new, better products and platforms are developed. After the September Apple Event's big unveiling of things like the i Phone 8, the i Phone 8 Plus, and the (drum roll, please!
For those who are sick of the repeated update alert, we get some tips.
Apple encourages every i OS users to have the latest version of i OS.
I’ve written a detailed step-by-step method that will help you get the look you want.
While the step-by-step method in the link is for the i Pod Touch 3G, the i Pad 1 will require the same process.