Could you describe the connection error you are experiencing in more detail? Is there a specific error code? This could help identify the root cause of the issue.

Also, regarding the simultaneous PHP update: have you checked if your current PHP version is compatible with the new version of the cart you want to update to? This could be the cause of the error.

Yes, you can still edit the footer.php file in version 1.4.0 to remove the "Powered By: AbanteCart" text. Navigate to the appropriate directory in your theme files (usually under `/storefront/view/default/template/common/footer.php`) and modify or remove the relevant code. Remember to back up your file before making any changes to avoid issues.