Issues with TVOne Corio2 C2-7100 outputting 240p

[Yert]

Hello everyone,

I've been toiling away for a good month or so with this TVOne Corio2 C2-7100, and I could really use some help. I'm trying to get it to output 240p, but I'm really at the end of my rope here.

The Issue:
The TVOne will only output 480i, which is the default preset.
Any changes to the resolution settings (refresh rate, resolution h/v, de-interlacing etc.) result in a total loss of output—no picture at all.

What I've Tried:
I closely followed Dochartaigh's amazing guide.
Connection Setup:
Input: RTX 3080 HDMI port → HDMI to VGA adapter → VGA cable → VGA to DVI adapter → C2-7100 DVI-I/RGB input 1 port.
Output: C2-7100 YC 1 output port → BNC male to RCA female coax connector → RCA cable → Toshiba 32A33 RCA video input port.
Presets Loaded: I connected to the Corio2 via Ethernet and loaded all the presets provided in the Shmups post.
Tweaking Settings: I adjusted all the resolution settings on the TVOne as much as my limited knowledge on the subject allowed.
Output Resolutions: I tried outputting different resolutions from my PC ranging from 240p to 2160p, all of which would only display when the TVOne was set to the default 480i resolution preset.

Next Steps:
I’m considering swapping the BNC > RCA output for an all-in-one BNC > component cable if I can find one.

Request:
Does anyone have suggestions or experience with getting 240p out of the Corio2 C2-7100?
Could there be a specific setting or connection I'm overlooking?
Would switching to a BNC > component cable make a difference?

If anyone has any suggestions or I can add anything else that might aid in your assistance, please feel free to reply to this thread or DM me.
Thanks in advance for any advice or help!

[satir]

try to switch to a BNC.