This is done via iTunes and it will automatically update the device to the latest available versions. Still, there are situations in which you will want to restore your iPhone without updating at all. For example, your phone may be jailbroken, so updating would change its status. There are also a lot of cases in which users have an older model, with just 16GB of storage, so updating it to the latest iOS version would result in a slower phone. Therefore, restoring the handset without updating remains the best variant.
How to Restore iPhone without Updating
Restoring iPhone without updating - Apple Community
As you keep on using your iPhone, you will notice that after a while it will start having several small issues. This is very natural in any phone that has been used for a few years. You may be facing issues such as lack of space, even after you delete multiple files from your iPhone, or you may be experiencing lags in operating your iPhone. These problems may occur due to a glitch in the software and can be fixed easily by restoring your device to the factory setting.
How to Restore iPhone without Updating to the Latest iOS Version
As we know, iTunes would restore and update to the latest software when we perform restore in normal procedures. Here I will tell you two methods to restore iPhone without updating to new iOS. Here are the steps.
Drunk night, and I changed the password. Now My iPhone X was locked. However, restoring my phone via iTunes requires an iOS software update.