Yeah, the one above had a sanity check that would fail if the NOR was garbage.
Try this.
It worked! My card is not a brick anymore!!
So just to clarify, I used the flasher you suggested here:
https://gbatemp.net/threads/r4i-b9s-flashcart-tested-and-impression.484620/page-23#post-7633409
And then I flashed the NDS backup from @pandavova here:
https://gbatemp.net/threads/r4i-b9s-flashcart-tested-and-impression.484620/page-22#post-7633078
Now shows the Bomberman Touch icon and boots the firmware. Now to test if the official flasher will revert it to the B9S mode