# Pairing the DeltaQuad Controller with the air unit
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After a factory reset has been performed on the DeltaQuad Controller, it might be necessary to rebind the controller with the air unit located in the DeltaQuad Evo. Please follow the steps below.
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1. Power on the DeltaQuad Evo and the DeltaQuad Controller. Open Auterion Mission Control. In the upper right corner of the screen, the Radio icon is located. If it has a strike-through and the radio link is not available, a rebinding is required.
2. Remove the hatch of the avionics bay by loosening the two screws with a Torx tool (T10).
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Please use a medium-strength lock bond when tightening the screws again.
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3. In the avionics bay you will see the radio modem. Push the *SET* button. This puts the modem into the bind mode. When in bind mode, the LED of the modem rotates through different colors.
4. On the Controller, open the Radio Settings app.
5. Open *WIRELESS PARAMETER CONFIGURATION*.
6. Tap on *FREQUENCY MATCHING*.
7. Click on *Confirm*.
After the binding process has been successful, a connection will be established between the DeltaQuad Evo and the DeltaQuad Controller.
