Does iOS Update Require iCloud Password?

Yes, the iCloud password is required after an upgrade to enable iCloud on the device.

Do you need Apple ID to update iOS?

You need your Apple ID and password to sign into the iTunes & App Store so that you can do the update. So, on a device that is not signed in under Settings>your name, go to Settings>iTunes & App Store and sign in there.

What password is needed to update iOS?

Apparently, the restriction code is set by the latest iOS update. When asked, enter in restriction code 123456 for six-digit requests and 1234 for four-digit requests–it appears these are the default settings. Then make sure you reset the iPhone passcode to something else and take note of that passcode.