Board Thread:Support Requests - Getting Technical/@comment-32266397-20190325025115/@comment-1038387-20190325103302

If you are an admin, you can delete the images the same way you delete pages. You can also overwrite the image with one with correct information.

For mass deletion, try w:c:dev:AjaxBatchDelete. However, if you don't have a bot, you might just do it manually. 25 isn't really Mass by most bot standards.