My problem is cannot update my at the same time there is already availlable updatect
Cannot download update..infact update is ready for download
iPhone 6, iOS 12
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Restart your iPhone 6, connect to Wi-Fi, and try again.
click or tap > Restart your iPhone - Apple Support
Failing that, connect to a Mac or Windows system, and update there. See the using your computer section:
click or tap > Update your iPhone, iPad, or iPod touch - Apple Support