Cannot flash firmware, A8 not showing as connected serial device

[kcampbell]

I use a Mac, and do not have access to Windows PC

When powering on the A8 I hear the series of relay clicks and the power light is on.

I have connected USB C to C cable to my MacBook, but "ls /dev/cu.*" does not show any connected device and so I cannot flash firmware.

Any suggestions?

Kevin