How do I see Di2 info on my HammerHead Karoo 1 or Karoo 2 device?
While most bike computers support Di2 out of the box, the HammerHead Karoo and Karoo 2 are special cases. A couple of months after SRAM acquired HammerHead, Shimano forced SRAM to remove Di2 support from the Karoo devices.
Fortunately for Karoo users, a helpful developer built an app that adds Di2 support back to these devices.
For more information, read this page by DC Rainmaker, or watch GPLama go through all the details in the video below.