This fixes GBA VC banners created with New Super Ultimate Injector v28 not showing the VC text box for non-US consoles.
To use either run the included nsui_banner_fixer.exe through the command line:
nsui_banner_fixer.exe example.cia
or copy all the .cia files you want to fix next to the executable and run the program by double clicking.
Either way your fixed .cia files will be created in the out directory.
WARNING: Overwriting an injected GBA game will overwrite its save file.
Consider backing up your saves before, e.g. with GBAVCSM.