Too many redirects" error

 I'm having problems with my WordPress site. After trying to switch the site's URL in WordPress settings from After http:// (math.) genus https:// The site crashed and now displays a "Too many redirects" error (ERR_TOO_MANY_REDIRECTS). I have an SSL certificate, but I can no longer access the WordPress dashboard to revert the changes.

Any idea what to do, maybe I'm missing something.

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