I think you misunderstood. TBC2 downscales and upscales between HD and SD already, it can cross convert between any of the input formats to any of the output formats.
The missing function @rempesm is referencing is aspect ratio correction, which is implemented but unreleased. Right now my focus with TBC2 is on fulfilling all the TBC2 preorders, and getting the second batch production underway. That’s been ongoing since late January, and has taken forever, but we are nearly there. Then there will be a firmware release that implements this function and more.
Follow this thread for the latest status: TBC2 has been released! - #38 by meudiademorte