The only way to erase iOS and re-install iOS is to restore as a new device in iTunes, which will also inherently update iOS, since older versions will not be available to choose from. There is no mechanism to install iOS without installing the latest version available and compatible with your hardware. Using 'Erase all Content and Settings' on your iPhone will cause the iPhone (if jailbroken) to erase all its contents and settings. iOS 10 apparently may have difficulty being JailBroken in the future, JailBreakers say it's a much harder challenge than ever before. You could then restore from an iCloud backup, and again, as with restore from backup in iTunes, iOS would not be touched. iOS 9 is currently at 9.3.5, which is not JailBreakable. Erase all content and settings does not erase iOS, just user and app data, and resets all user alterable settings back to default. If, on the device, you choose to "erase all content and settings" it will be erased but iOS will be unaltered unless you choose to update over the air or in iTunes later. You can then still restore your backup from the previous iOS version, but that will not alter iOS on the device. If you choose to "restore device" then yes, it will be erased, and it will be updated to the latest iOS version available and compatible with your hardware. Then follow these steps: Go to Settings > General > Software Update. In iTunes, if you specifically select to "restore from backup" then the version of iOS on the device will not be touched at all. Make sure your device is plugged in and connected to the Internet with Wi-Fi.
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