security – The Robots.txt file is not updated

One of our site robots.txt the file is not updated, deleted .htaccess and robots.txt root folder file one of the suggested answers
Why does Google Webmaster Tools report that my entire site is blocked by the robots.txt file when I do not have a robots.txt file?

I thought that there could be a conflict of plug-ins. I have therefore completely disabled the Yoast SEO and Security plug-in that affects the file. but remains robots.txt the file shows me as

User Agent: *
Not allowed: /

User Agent: Googlebot-Image
Not allowed: /

Any other suggestions or help that may help to update the file will be greatly appreciated.

Thank you !!