How to fix ExpressLRS receiver not binding to the transmitter

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

Answer: First, ensure both your ExpressLRS transmitter module and receiver are flashed with compatible firmware versions. Mismatched versions often cause binding issues. Next, verify the receiver is powered correctly, typically 5V or 3.3V as specified, and that the antenna is firmly connected. Put the transmitter into bind mode by selecting it on the transmitter module or via your radio’s menu, then power on the receiver while it’s in bind mode (usually by holding a button or shorting pads as per your receiver’s manual). Watch for LED indicators on the receiver—usually a blinking light means it’s searching, and a solid light means it’s bound. If it doesn’t bind, try reducing distance between transmitter and receiver to under 1 metre and avoid interference. Also check your receiver’s UART or SPI connection to the flight controller if applicable, as miswiring can prevent binding. Finally, confirm the receiver’s CRSF or ELRS protocol is selected in your radio settings. Following these steps will solve most binding problems with ExpressLRS gear.