can't update MacBook Air to sur on high Sierra trying to restore iPad and says error 4

Hi,

We understand you are unable to restore your iPad and are receiving an error, specifically error code 4. We would recommend the guidance in the following article, under the section "Check your security software" that can help:

iOS update and restore errors

Hope this helps!

Have a great day.

shon232,

Thank you. After checking for any third-party security software, the next step would be to check the USB connections as listed in the resource. If you continue to receive the error, we recommend that you reach out to Apple Support directly. Please reach out here:

Get Support

Thanks.