How do I erase all remote controls, keyless entries, and MyQ devices from the garage door opener?
Press and hold the LEARN button on the garage door opener until the learn LED goes out (approximately 6 seconds), then immediately press and hold the LEARN button again until the learn LED goes out. All codes will be erased and you can reprogram any accessory you wish to use. (Page 35)
From the official Chamberlain Chamberlain Garage Door Opener manual, page 35
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