Either the Boomerang is defective or the BeatBuddy is.
Best way to test that is if you happen to have another device that can send Midi to the Boomerang, like OnSong or a Molten Voltage box. If the Boomerang detects that then the BeatBuddy is defective. If not, then the Boomerange is defective.
Or if you have a MIDI to computer interface you can try to send MIDI from the BeatBuddy to the computer and see if that works.
Bottom line, test both the BeatBuddy and the Boomerang with a 3rd device top see where the problem is.
If it’s the BeatBuddy we’ll replace it for you. If it’s the Boomerange, you’ll have to contact them in regards to this issue.