Dear ROBOTIS Team,
If you have failed booting the RPi after burning the Ubuntu image with etcher, you might want to try other software.
Raspberry Pi Imager is an official Raspberry Pi software that supports image recovery.
Please note that the monitor should be connected to Raspberry Pi BEFORE the Raspberry Pi is turned on.
OpenCR does not come with a basic firmware because ROS1 and ROS2 requires different OpenCR firmware.
You should select the ROS version and install correct OpenCR firmware thereof.
Please follow the OpenCR setup instruction from the eManual based on your selection of ROS version at the top of the Manual.