The latest version of Variax firmware works with Helix v2.30. If your Variax worked OK with previous versions of Helix firmware then it should still work; there was nothing in the v2.30 update that should affect Variax operations.
Check the VDI jacks on both the Helix and the Variax. Visually inspect them to see if there are any bent pins at the connectors. If so, fashion a J-hook out of a thin wire - something like a bread-tie - and gently pull the pins back into position.
I just checked the pins, and they look good on the Variax and the Helix. I can get power to my Variax (without using the on board battery) from my helix, so the DVI seems to be connected.
I bought my Variax 2nd hand, so I'm not sure of the Firmware version of it. This is my first time connecting it to my Helix. The seller did not include the USB dongle, so I'm stuck waiting on the workbench hub to arrive in the mail to find out the version.
My concern is that the Variax is on such an early firmware version that the Helix is not supported. Are the old JTV firmware versions compatible with the Helix at all? Will a firmware update to the Variax resolve this, or am I just spinning my wheels?