This assumes you already have the latest version adb/fastboot installed on your Mac.
There's plenty of info here and else for that.
You are responsible for unlocking the bootloader.
Unplug all other USB devices. Most important step. It seems the HTC sometimes wants to own the USB.
Plug U11 into USB.
Toggle USB connection on U11 to File Transfer.
Launch Terminal (utilities) on your Mac.
enter "adb devices” in Terminal - should get serial back in Terminal window.
In Terminal - “adb...
Read more
There's plenty of info here and else for that.
You are responsible for unlocking the bootloader.
Unplug all other USB devices. Most important step. It seems the HTC sometimes wants to own the USB.
Plug U11 into USB.
Toggle USB connection on U11 to File Transfer.
Launch Terminal (utilities) on your Mac.
enter "adb devices” in Terminal - should get serial back in Terminal window.
In Terminal - “adb...
Read more