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Can't login into my WP admin Panel after php update

I'm running wordpress on plesk and I recently updated my php to version 7 then realised i had to revert back to 5 but since ive reverted back my wp-login just redirects to itself no error messages it just reloads.

 

i've tried clearing cookies and cache, disabling plugins and i've disabled the theme nothing made a difference, ive even tried a new install of wordpress and the same thing is still happening.

 

does anyone have any advice on what the issue might be?