I want to update my iPhone 6 Plus to iOS 13

We already posted the answer to your other question in another thread.

The answer is the same.

The iPhone 6+ is obsolete. The best that it can do is run the very old iOS 12.5.7.

There are no more updates for the iPhone 6+

senior97 wrote:

I want to update my iPhone 6+ to ios 13 or 14 please help me this is my first iPhone

[Re-Titled by Moderator]

I'm sure you do, but you simply can't do that on such an old, out of date iPhone. If you need higher level iOS versions, then it's time to retire your 10 year old obsolete iPhone and buy a newer, more modern iPhone.

It doesn't matter how many times or how nicely you ask, the answer is ALWAYS going to be the same.