OpenBuilds Control ver 1.0.376 - No BlackBox 4x showing up

I am trying to flash a .hex file to a DIY Arduino controlled Plasma Cutting Table (JD's Garage). In the YouTube instructions, using OpenBuilds Control's (v1.0.370) the Flash Firmware tool, it shows that a .hex file choice under the BlackBox 4X which is being used to flash the .hex firmware file. After I downloaded the Controls v 1.0.376 (latest version, 1.0.370 not available anymore?) and followed the exact instructions, I do not see the BlackBox 4X choice. Trying the BlackBox 32X or Interface choices, a selection for a .hex file is not given. Only a .bin file is given. This is not my forte' and I am lost. I only need to burn this firmware so I can use my plasma table. I've had problems before but then suddenly it "worked" but now I'm at a loss again. I am an absolute beginner and have no idea how all this works so keep it simple for "Stupid" person please. Thanks for any help in advance.

Note: I had all this working before but updates to Fusion 360 and trouble with blue tooth connections caused issues and updates (instructed by JD's Garage), I decided to start from scratch to make sure everything was "up to date" Bad Idea!! So now I'm dead in the water. I don't want my Plasma Table to turn into a "useless" dead space in my garage!

RockT