Uploading Sketches to Adafruit Feather MO

I am very frustrated trying to upload sketches. I have been successful in 4 of about 100 tries. The system is not finding the port and is trying to use a Bluetooth port. I have used multiple cables, tried resetting the board, restarting the MAC, and disconnecting things attached to the Feather. I have an Early 2008 iMAC running Yosemite 10.10.5. I cannot disable Bluetooth because I would lose my Bluetooth mouse. Any suggestions would be appreciated.

use double reset to activate bootloader right before upload

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