Converting Wangan Dead Heat

Helo there ! Here is my problem, I used to buy japanese games, make an image of the CD, change the country code (using Satconv) and play it with a swap trick. But with this game, when it boots, it tells that this game is made for another country... So here is my question : is there another part of the image that Satconv doesn't modify, and that I need to change manually, and if so, where ? If not, what is exactly the problem ? Thanks in advance.

P.S. I don't want to mod the console or buy a cartridge, as it worked on every other games before...

And I changed the code from J to E
ive had that happen before

check if your image says et on the teritory part of the header

if so try adding -r to the end of the line, that fixed it for me anyway