what is the software for a iphone xr

Hello!

Your iPhone XR can be fully updated to the current iOS, which is iOS 16.6.

However, if you’re not there yet, please tap here to learn how to update your iPhone. 

👉 Updating/upgrading your iPhone 

If your iPhone won’t update, please see: If your iPhone or iPad won't update - Apple Support. 

👉 Updating iOS: common issues and solutions - Apple Community

👉 If you see error 9, 4005, 4013, or 4014 when you restore your iPhone

I hope this is helpful. Good Luck!

An iPhone XR, which was released by Apple in September 2018, cannot have ever used iOS 11.X. The iPhone XR requires at least iOS 12.

That's not what it's telling you.

11,8 is the internal model number for the iPhone XR.

Stop poking around in the analytics. You don't have the tools or the training to interpret them properly.

Correct, as that is the Apple internal identifier for an iPhone XR.