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Hi brought a new mavic 3 few days ago set it up with my account all good then wife brought me a new rc pro transmitter bound it to drone but each time go for a fly I get a warning that drone is bound to another transmitter I have tried for hours to delete the std tx an bind Rc pro to drone but no luck each time I switch on I get the warning How do I sort this problem after spending over £2400 this is not good

Start it up with the original controller. Then unbind it. Start the RC Pro and bind it there.

Hi there. Thank you for reaching out. As Mobilehomer responded on post #2, you need to unbind your original controller by re-linking it in General Settings > Control > Re-Pair to Aircraft.  After that, turn on the other controller and start linking it with your DJI Mavic 3. You may refer to the tutorial link below for your reference. Hope this helps