I already told you. Get a 9.2 ctrtransfer image and ctrtransfer on your emuNAND. Then update it to 11.2 with the right files and sysupdater. If you own a gateway card, you can follow the tutorial to use Gateway on B9S. Any other method of booting Gateway besides following that tutorial involves uninstalling B9S on your system as well as a brick risk.
And please understand it is impossible to load Gateway mode in any way at all if you do not have a Gateway red card. Gateway is closed source and nobody has been able to separate the rom loading menu from the check for the red card. If the red card is not detected, Gateway mode will not launch no matter which way you are trying to launch it. No launch method in the entire history of the 3DS will work. Not B9S, not A9LH, not browser, not homebrew, and not MSET.