I want Apple signed software version 15 or 16 for iPhone XS 11.2

We cannot provide signed software for you, as apple users. If you're still on iOS 11.2, you can update to iOS 17 on your iPhone XS, but you will need to do that via a pc or mac

Update your iPhone using a Mac with macOS Catalina or higher

On a Mac with macOS Catalina or higher, you will use the finder in order to upgrade your iPhone. Make sure to Back up your device before starting the upgrade process.

On a Mac with macOS Catalina or later, you will follow the following steps:

1. Open a finder window
2. Connect your device to your Mac via a lighting to usb A or a lightning to usb c cable On the iPhone 15 series, use an usb c to usb c cable.
3. Select your device in the left sidebar of the finder window
4. click general, then click check for update
5. Click download and update.
6. If asked, enter your iPhone passcode

Update your iPhone via a Mac running macOS Mojave or earlier, or on a Windows PC

On macOS Mojave or earlier, or on a windows machine, we won't use the Finder to upgrade your iOS

Instead, we will use iTunes. Make sure to Back up your device before doing any update or upgrade to your phone.

1. Open iTunes
2. connect your device to the computer with an lightning to usb a or a lightning to usb c cable. On the iPhone 15 series, use an usb c to usb c cable.
3. Click device button in the iTunes toolbar
4. In the summary tab, click check for update
5. Click download and update, follow The on screen instructions
6. If asked, enter your iPhone passcode.

TrongHuyp wrote:

I want to down to 15 or 16 please Apple Support

You cannot downgrade iOS .

Warning: Any lower version software you find online is fake and dangerous.

It might depend on your unidentified iPhone model.

Please identify it, using these instructions:--> Identify your iPhone model

Then take a look at this compatibility list: