Error code when uppgrading.

For information, Apple provides the following guidance for addressing error #1109:

If you see Error 3194, Error 1109, or other network connectivity errors when restoring your iPhone or iPad - Apple Support

This error implies a network issue affecting the computer being used to restore or update the iPad - often caused by using a VPN and/or Antivirus/Security software.

Have you tried updating your iPad directly from iPad settings?

You would be best advised to seek assistance directly from Apple Support. You can contact the Support Team using the Support link at top-right or bottom-left of this page.

Alternatively you can initiate and manage your support cases from another Apple device using the excellent Apple Support App. If not already installed, the App can be downloaded from the App Store:

https://apps.apple.com/app/apple-support/id1130498044

You might also visit the Genius Bar at your local Apple Store or Apple Authorised Service Provider (AASP) - where the technicians will be able to assist with troubleshooting:

Genius Bar Reservation and Apple Support Options - Apple