yun mini firmware update

I have a yun-mini and i want to update the firmware on it but the only instructions I can find are for the yun (not mini) and they mention using the sd card slot or master usb port, neither of which are included with the mini. In general, I've had a lot of trouble finding any reference material that is yun-mini specific so if any of you could point me in the right direction, i would appreciate that.

Thanks

I got a reply from arduino support and they gave me this link to an archived version of the yun mini "getting started" page.