Error while installing iOS 14.5

I can’t install the current iOS, my current system is 12.2... I’ve reset the network system settings, I’ve re-downloaded the iOS 14.5 & still doesn’t install. I don’t know how to install it update my phone to connect to my new Apple Watch
Which iPhone is it ?

What exact error message do you get ?

When you go to Settings > General > Software updates, what do you get ?
Do you get proposed iOS 14.5.1 ?
Did you download from there ?
Error while installing iOS 14.5
 
 
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