Why i am not able to install my system update

[AC Question]

I have yu yunique and has got system update of volte. But when i download and install it only recovery mode appears and and after rebooting it again tells to download like there is a new system update available

 

[Rukbat]

Is the phone rooted? Most updates won't do anything with a rooted phone.

Or the update could have failed.

See your carrier.