How can I updated my iPhone 6

You don't have enough free space on your phone. You'll need to delete some things.

Marking your own post as Solved may prevent others from trying to help because they think you have fixed your problem.

See if anything here helps. 

Disk space - How to check the storage on your iPhone, iPad, and iPod touch.    *

 Disk Space – Free Up    -

 Disk Space – Free Up (2).  -

 Disk Space – Free Up (3).  -

 Disk Space - Free Up (4)    -    

 Disk Space - Free Up (5)   -  

ASC YouTube for how to free up space on your iPhone, iPad, or iPod touch  

Eric Root wrote:

Marking your own post as Solved may prevent others from trying to help because they think you have fixed your problem.

I promise I'll never mark my own posts "solved". ;-)

My oops. Obviously that was meant for the OP.

Eric Root wrote:

My oops. Obviously that was meant for the OP.

I know. Just teasing. It's been a long, rough week. Even little things like this amuse me right now.