why won’t it let me update my phone? it says that an error has icored while trying to update or something

It would have helped us better to answer your question if you would have explained what that, "or something" exactly is.

Make sure that your iPhone is setup to meet the following requirements before you attempt to update the iOS version over a Wi-Fi Network. Open Settings ➔ General ➔ Software Update: If there is an update available for your iPhone then it will be listed here. Follow the on-screen instructions to download and update your iPhone. 

• Your iPhone must have a fast Wi-Fi connection; you cannot update over cellular data or a cellular hotspot
• Ensure that you do not have a beta profile installed from a previous version
• 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
• 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.

destinie80 Said:

"why won’t it let me update my phone? it says that an error has icored while trying to update or something: it just doesn’t work!!!"

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Two Things:

A. Try Later On:

There is reportedly issues connecting to Apple's servers. So, you'll have to try later on, if using your iPhone.

or...

B. Use a Computer to Update:

Use my User Tip: Update your iPhone Using a Computer - User Tip