Step 1) Remove old Focbox by unscrewing the 3 Philips screws on the Etray and the 4 Philips screws holding the focboxes on to the etray underneath. Also unplug all of the connections including the sensor wires, CAN cable, Receiver wire, Etc.
Step 2) Attach the Unity on to the Etray by using 4 of the screws that were removed from the old Focboxe. Also re-secure the Etray to the enclosure by reinstalling the 3 silver screws initially removed.
Step 3) Plug all of the connections back as they initially were
Step 4) Follow this guide https://enertionboards.zendesk.com/hc/en-us/articles/360000774196-How-to-Update-the-Unity-for-a-Raptor-2-1-or-DIY-Board-VIA-Android-OR-Windows-PC (Follow for either Android or PC Calibration)
Step 5) Follow this guide to close the board. https://enertionboards.zendesk.com/hc/en-us/articles/360000340975-How-to-reseal-your-R2-after-opening-it