Admin can’t install or delete plugins, update wordpress etc

Hi everyone,
I need help: I’m an administrator of my site but I no longer have the ability to install or delete plugins, update wordpress like a normal administrator. I can create articles, pages, users, but even if I create an administrator user, he does not have the ability to delete or install plugins …. or update WordPress too.
I found a plugin on my server called “linklove”. Someone install it!!!. I downloaded it to my Pc desktop and my antivirus (AVG) quarantined it: there was a malicious PHP script. In my MySql database the administrator user does not have a normal value wp_metauser a: 1: {s: 13: “administrator”; s: 1: “1”;} … but a: 1: {s: 13: ” administrator “; b: 1;}. I changed this value with the previous one but the problem remains. I installed User Role Editor and even if I see all the right permissions for the administrator user the problems remain. I’ve already updated wordpress to the latest version manually but it doesn’t improve. I activated a default theme and disabled all plugins and the problem remains. Who helps me???

• This topic was modified 6 years, 11 months ago by cirowp.