I'm trying to bind nbd hummingbird elrs with my rm boxer elrs. 


nbd says the receiver is in 3.0, and i updated my boxer to 3.3 

i plugging and unplugging the drone three times and hitting the bind button, along with selecting "bind" on the controller with no luck. 

any suggestions?

Use a binding phrase instead. You can set it from the webui on your TX and if you have a serial receiver, or you can set it on the receiver tab in Betaflight if it's an SPI receiver.