Thanks for sharing Andrew. I’ve heard reports of issues with the THX Tune Up app with newer versions of iOS. You might also want to consider native calibration apps, such as Calibr8 app for Apple TV - it comes with a library of professional grade AVS test patterns.

Because Calibr8 app runs natively on the Apple TV,…

Hey, have you tried Calibr8 for Apple TV? I like the wide range of test patterns, with instructions that regular and advanced users alike can easily follow.