Keep in mind that while repeater mode can be a convenient solution, it may not always provide the best performance. Consider alternative solutions like a Wi-Fi mesh system or a more powerful router if you have a large area to cover.
If you're concerned about proprietary firmware limitations, consider using free and open-source firmware alternatives like:
halfway between your main router and the dead zone. It must be close enough to the main router to receive a strong signal but far enough to extend that signal into the new area. DIR-868L Repeater Mode Setup Guide | PDF - Scribd
Users looking to save money who are comfortable with basic web-based configuration. Not recommended for: Users expecting seamless roaming (this won't hand off your phone call automatically like a mesh system would) or gigabit speeds.