Upgrade to iOS15 before new iPhone transfer?

[michial]

To ensure the speediest transfer of my current iphone to my new iPhone 13 Pro Max, which is arriving 9/24/21, should I upgrade my current iPhone 11 Pro to iOS 15 before then?

 

[Shirasaki]

No. I believe any supported OS will be allowed to transfer. Worst case scenario just restore from iCloud backup.