A connection to other devices is necessary, as the printer must receive information from other devices in order to print materials. Your Brother Printer could be listed as "Offline" because it is not turned on, it has errors such as empty toner, it is not set as the default printer or its USB cord or its Network have a connection problem. https://www.behance.net/gallery/108740083/Brother-Printer-Not-Found-ErrorAll Rights Reserved