My iPhone X WiFi Updates don’t work

Ok, see if the following articles can be of more help:

• If you see an error when you update or restore your iPhone, iPad, or iPod - Apple Support
• iOS update and restore errors - Apple Support << Unfortunately, error "4000" is not listed as one of the error codes.

If neither do, you will need to contact Apple Support directly for further assistance with this issue. To do so, simply select the "Get Support" link in the upper right-hand side of this forum's web page.

***UPDATE***

I came across the following that do discuss error 4000:

• If you see Error 4000 updating your iPhone with Windows iTunes - Lawrence Finch ASC
• How To Fix iPhone Could Not Be Updated Error 4000 in iTunes - GTU
• How to Fix 'Update Error 4000' on iPhone? - Appuals

I suggest starting with this support article: If your iPhone, iPad, or iPod touch won't update - Apple Support

If any of the following are true, your phone may not be able to update:

• The specific phone model does not support the update. This shouldn't be the case for your iPhone X.
• The phone is "jailbroken."
• The phone is running an iOS beta. If so, then you will need to remove the beta profile first.
• The phone does not have enough free space. Typically it should have at least 5GBs available to update.
• The phone is configured for either or both Low Power Mode or Personal Hotspot.
• The phone is not connected to power and it has less than 50% charge left.
• The phone is not connected via Wi-Fi to the Internet. It won't update on a cellular-only connection … unless it is on certain 5G cellular networks.
• The phone is connected via a VPN.