ROS2 firmware version 1.0.0

The emanuel for ROS2 operations with turtlebot3 located:

Calls for ROS2 firmware of 1.0.0 or higher to be used and also gives the following URL to download the firmware:
This link appears to be down when I click on it. Is there an alternate link to download the firmware?

This link is a raspbian image file, not firmware.
Do you need the firmware to upload to OpenCR?