How can I update iOS 14 on my iPhone 6 Plus?

Your iPhone 6 cannot be updated past iOS 12.5.7, and will no longer receive software updates.

Now that your device is obsolete, it’s time to upgrade to a new iPhone, which is recommended to run the latest software, iOS 18.

Iphone6plus no update

You are correct. There are no more updates for the iPhone 6 Plus.

Frankly, you need a new phone.