Older UMvC3 rips used a specific default.xex (the Xbox 360 executable) that causes a black screen on Xenia Canary post-version 1.0.2800. A ROM has been re-dumped or patched with the xex_fix to bypass title-specific checks. Without this, even if you have the file, it won’t boot.
: The only official way to play on original hardware is via a physical disc. 2. Sourcing "New" or Physical Copies ultimate marvel vs capcom 3 rom xbox 360 new
You should only download ROMs for games you physically own. Support the developers by purchasing the "Greatest Hits" or digital versions where available. The Legacy of UMVC3 Older UMvC3 rips used a specific default