DVI mode is where it has always been afaik, under output options.
You don’t need a <2 GB SD card if you are on 0.83, that was for way earlier fw versions.
If you update to 0.85 you can try using setting VIC mode manually (under compatibility options). You can google which VIC is for which output format.
Reset settings is always worth a shot also.
If the monitor has proven compatible for others, maybe start suspecting your VGA cable anyway…