Cannot download and install iOS 15.1 update on my iPhone 7. Please advise

Miajay17 Said:

"Please advise on iOS 15.1 update when I can’t download and install the it on my iPhone 7"

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Use a Computer and Ethernet:

Start with attempting an update through use of a computer. If you cannot use Wi-Fi, then use Ethernet.  See my User Tip: Update your iPhone Using a Computer - User Tip. On the computer, you would connect it through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple. If you get the same error, the model is likely just not compatible.

Miajay17 Said:

"I am connected to WI FI"

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Thank you for the followup.

Use WiFi:

If WiFi is working, then continue updating this on your computer, through use of WiFi.