It sounds like you're experiencing a compatibility issue with the Radeon Pro WX 2100 GPU and the Dell Optiplex 755 BIOS, specifically regarding the supported video mode (VESA 103). Unfortunately, the BIOS of the Dell Optiplex 755 may not recognize the video mode supported by the WX 2100, resulting in the error message you mentioned.
As for obtaining a newer VBIOS (Video BIOS) for the Radeon Pro WX 2100 that supports VESA 103 video mode, this would typically be provided by the GPU manufacturer (in this case, AMD). However, GPU VBIOS updates are not as common or readily available as driver updates, and it's unlikely that AMD provides VBIOS updates specifically to address compatibility issues with older BIOS versions of third-party systems.
Here are a few suggestions you could try:
Contact AMD Support: Reach out to AMD's support team and inquire about the compatibility issue with the Dell Optiplex 755 BIOS and the Radeon Pro WX 2100 GPU. While they may not have a VBIOS update specifically for this issue, they may be able to provide further guidance or suggestions.
- Update Dell Optiplex BIOS: Check if there are any BIOS updates available for the Dell Optiplex 755 from Dell's support website. Sometimes BIOS updates include fixes or improvements related to hardware compatibility.
- Alternative Connection: If possible, try connecting the monitor to the onboard graphics (if available) or a different GPU temporarily to access the BIOS settings. Once you've configured the BIOS settings as needed, you can switch back to the Radeon Pro WX 2100.
- Explore BIOS Workarounds: Some users have reported success with BIOS workarounds or tweaks to bypass compatibility issues. However, these methods can be risky and may not always work.
- Consult Forums and Communities: Search for forums or communities where other users may have encountered similar issues with Radeon Pro WX 2100 GPUs and older BIOS versions. They may have found alternative solutions or workarounds that could be helpful.
Ultimately, if none of the above suggestions resolve the issue, you may need to consider alternative solutions, such as using a different GPU or accessing BIOS settings through alternative methods (e.g., remote management tools if available for the Dell Optiplex 755).
