Hello,
i had the same problem on iPhone 7. After requesting update to iOS 14,3 on iPhone 7.
download started and after it was preparing to install. After that I got an error saying, that cannot be installed.
I removed/ turned off passcode for unlock and everything.
switch back to software update and it begun the installing of new version.
Time necessarily for software download and software installation -something like 30 minutes
Adrian_Zunu
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Medias, Romania