403 error when accessing wp-admin

[Oxy]

You can do this first (because maybe it’s just a syntax error somewhere )

Http error 500

When trying to access your website, you may see a page which returns the status code “500”. In Google Chrome, you’ll see a page with the error code HTTP ERROR 500. There are typically two reasons which can cause this error: The PHP code has crashed. The .htaccess file contains invalid rules. Here are some things you can try to debug and fix this. Fixing crashing PHP code A HTTP ERROR 500 simply tells you that the PHP code has crashed, but gives no information as to why it has crashed. Gett…

@SpanishCrusader

and just restore all the content

Of course - since you have backups then you can do whatever you want.
P.S. edit wp-config.php if necessary !