Tried bleeding the brakes with Tune ECU today, Tune ECU is a little short of info on what's happening, or what you're supposed to do.
Tune ECU goes into what appears to be a continuous loop of bleeding cycles of around 10 seconds each, with a 10 second pause. So I squeezed the lever and opened the nipple while the bleed cycle is working, but not sure what I've achieved.
One thing to watch out for is with the lid off the reservoir the initial squeeze of the lever sends a squirt of fluid from the reservoir, clear over the rags I'd wrapped around the reservoir, and landing on the lever pivot which then drips on to the tank.
Unfortunately I'd not noticed as I was focused on opening and closing the bleed nipple where the plastic pipe kept falling off and dropping fluid on the wheel etc...
So a right messy business!