How to fix DFU in failsafe mode with arducopter 4.2.1

I am trying to revert back to Betaflight to see if I can get gps to work. I get the message that DFU is in failsafe mode when I use the BL button on the Kakute h7 , thus I am unable to install BF firmware. I have used Impulse driver fixer and Zadig and installed arducopter 4.2.2. I have disconnected all sensors except for camera and buzzer.