SWAT has updated this program to change the region and video output on any Dreamcast console given a small hardware modification.
There’s only one new thing in 1.6 but it’s a significant addition: the possibility to set the console as region free (showing a black swirl at boot; thanks to Mr. puch666)

Get it here.

Note: Users have tested this version and it is not region-free; it simply is a Japanese region flash with a black swirl.