Update for iphone 6 plus

Your 9 year old iPhone’s hardware is not capable of running a version higher than 12.5.7. If you need a newer version you will have to replace the phone with a newer model. An iPhone 6S or later can run iOS 15, and an iPhone 8 or newer can run iOS 16.

Hello Vszx!

Your iPhone 6 Plus can be updated until iOS 12.5.7.

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

I hope this is helpful. Good Luck!