Installed 1.21.0 (2020080400) accidentally in a 3.10+ moodle

Hi, I recently installed the latest version 1.21.0 in a 3.10+ moodle version "by accident" (read: me not paying attention to what version h5p is compatible with). After that installation I cannot access/open by Admin menu anymore in Moodle. If manually go to a admin URL (like plugins) then I get this error (see screenshot) My question now is: how do I uninstall H5P without having access to the admin UI? Deleting folders? if so which ones and where are they located?