I am not able to install the update its giving error
Its giving me error while installing the update
iPhone 11, iOS 14
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Without the error wording I can only suggest you remove any VPN then read
Update phone
Click on this link
Update your iPhone, iPad, or iPod touch - Apple Support
Phone will not update
If your iPhone, iPad or iPod touch won’t update - Apple Support
User Tip updating iOS
Updating iOS: common issues and solutions - Apple Community