mixed contents admin panel is Unsecured

That should not effect wp-admin, I have never seen that happen before. Are you sure both your site url and homepage url’s are set to https://

If you really want to change them to see if that is the issue, you could edit them in the following files: (there are multiple mentions of that url in some of them)

/wp-admin/includes/template.php
/wp-admin/maint/repair.php
/wp-admin/setup-config.php
/wp-admin/install.php
/wp-admin/upgrade.php

I will be very surprised if that is your issue.

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