HTTP ERROR 500 / no admin access

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Hi there

when i tried to solve some problems with our website today, i had to change the file wp-config.php. I changed the wp-memory-limit and saved the file. Everything still worked. Then I changed the php max time limit. I saved it again and then I got the message HTTP ERROR 500. I can neither log in to my website nor can I drag the backup wp-config.php file into the WP File Manager. As soon as I try to edit the file, I get the message Invalid backend response. Error occurred on the server side. HTTP error 500
I urgently need help!

Thanks in advance to everyone trying to help..

The page I need help with: [log in to see the link]

 

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