Why won’t my ExpressLRS receiver bind to the transmitter?

Question: Why won’t my ExpressLRS receiver bind to the transmitter?

Answer: First, ensure both your transmitter and receiver are running compatible ExpressLRS firmware versions. Mismatched firmware can prevent binding. Next, power on your receiver and put your transmitter into bind mode—usually by selecting the bind option in your radio’s menu or pressing a bind button. Check that the receiver’s bind LED is flashing, indicating it’s ready to bind. If it doesn’t flash, confirm the receiver is properly powered (typically 5V or 3.3V, depending on the model) and wired correctly.

Make sure you’re using the correct UART or serial port on your flight controller if your receiver is connected via CRSF. Also, verify that the receiver is set to the correct model or binding address, especially if it supports multiple protocols or modules.

If binding still fails, reset both devices, power cycle them, and try again. Finally, consult the ExpressLRS documentation for your specific hardware, as some receivers require holding a button during power-up to enter bind mode.