You probably need to set up the OpenUPS board again. Start with downloading the OpenUPS software:
OpenUPS software for Linux
OpenUPS software for Windows
OpenUPS software set up manual
Once the software is installed, click on the "Settings" tab of the pop up window. Click on the "File => OpenUPS" button to load and replace the settings files.
The Turtlebot 3 Burger mobile education base is a lightweight, compact, low-cost and customizable ROS-based mobile robotics platform. It is the perfect solution for anyone looking for a fun way to support their robotics programming workshops, but also for robotics apprentices, designers and developers.
The resources available for Turtlebot3 are very numerous. Here is a link to all ROS installations for TurtleBot3