2si controller replacement rebind

[nickmjones]

I just received a replacement TAGs-FX controller from the good folks at Heli-Max for my 1si. I've installed it without issue, but it now the rear LED is flashing that the quad isn't paired to the TX. I can't find a procedure anywhere for rebinding to the stock Heli-Max TX. Anyone have any ideas? Figured I'd try here before I get on the phone again. I've tried powering the quad, then the TX and vice versa. As far as I see, there isn't much else to try unless one of the buttons on the TX is also a bind button.

Thanks!