
He has a Gateway card installing dev menu.cia to sysnand using dev menu.3ds is much better.boot HBL, run minipasta, boot hbl again from minipasta, run fbi from hbl then install bluefix.
Or you can install Devmenu from there if FBI should complain. But you need to boot to minipasta to launch devmenu.
There's no real need to inject FBI to H&S since you'll most likely only do this once.
He has a Gateway card installing dev menu.cia to sysnand using dev menu.3ds is much better.

Yes just boot Gateway Sysnand mode this has been a thing for quite a while now.What, you can install to sysnand using gateway now?!
The blue card has a OS of sorts that you put on the SD card in the blue card. it should consist of folders like _rpg, moonshl2, and some files on the root. This is the OS of the blue card and if left blank it cannot do anything. These should come in the GW rar. I think what I use is from R4 cards specifically.Bluecard firmware: Download latest GW zip, extract, copy everything from Blue Card (R4i) folder to the root of your blue card sd.
Also, DS flashcarts don't work in emunand. (Not without https://gbatemp.net/threads/twl-slot-1-launcher-first-custom-dsiware-app.414501/ and even with that Bluecard does not work. Your R4 MIGHT though.)
s well that's a problem there,i don't own any official game cartridge but I could when the flashcards were unblocked,if that helps..First off, do regular ds games work? This may be a problem with TWL_FIRM, you never know.
If non-flashcarts do work, I would try using a cia of FBI and setting destination to NAND. Then try to run the blue card.