A functional limitation was discovered with the most recently manufactured batch of Pigeon 2s.  When used on a CANivore (CAN FD) bus, the Pigeon 2 may not transmit CAN FD frames correctly.  As a result you may find that all CAN device LEDs go red when the Pigeon 2 is in-circuit and powered.  

This only occurs with Pigeon 2s with a manufacture date of Sept 2022.
Note this limitation has no effect when using the Pigeon 2 on the roboRIO CAN bus.

New Firmware CRFs

New firmware CRFs were released to address this issue.

23.1.2.1 (Phoenix Pro) and 22.6.3.1 (Phoenix v5) (Change log)

Procedure

In order to update the Pigeon 2 one of the following can be done

• Connect Pigeon 2 to roboRIO CAN bus*, and use Tuner or Tuner X to update Pigeon 2
• Connect Pigeon 2 to CANivore directly** (no other devices) and use Tuner or Tuner X to update Pigeon 2

 ** Note: We recommend power cycling the Pigeon after switching to roboRIO from CANivore.
 *** Note: You may need to terminate the free pigtail of Pigeon 2 with a termination resistor (120Ω).

Additionally an update to Tuner X and Phoenix will be released soon that contains a procedure that allows updating the Pigeon 2 with CANivore without needing to change the CAN bus wiring or connecting to the roboRIO CAN bus.

EDIT: Tuner X update is now released.  Documentation is now available.