How to install iOS 14.2 in i phone 7plus ?

This is a user helping other users with tech questions

forum, you are not addressing apple here  just  fellow users

I would try connecting it to a computer with itunes and upgrade it that way

Update your iPhone, iPad, or iPod touch - Apple Support

There are two things that I can think of asking you however a whole list is shown below. Do you have at least 6GB+ in free storage space on your iPhone 7 Plus? Do you use a VPN (if you do then turn it OFF)?

Make sure that your iPhone is setup to meet the following requirements before you attempt to update the iOS version-

• Your iPhone must have a fast Wi-Fi connection; you cannot update over cellular data or a cellular hotspot
• The iPhone can not be in Low Power mode
• The battery state of charge must be above 50%
• Your iPhone must have at least 6GB or more free storage space
• Your iPhone cannot be connected through VPN
• If you are not planning for it to update automatically you should turn this option off, as it will only update when the phone is plugged in, connected to Wi-Fi and locked
• You should leave the phone plugged in until it finishes updating, both to assure that it remains above 50% and to keep Wi-Fi enabled (Wi-Fi turns off when the phone sleeps if not connected to power).

Axel F.