LOL, i installed Ninjhax on my 3DS XL with FW 9.2.0.20, so after playing with it for a few days i decided to ninjhax my other 3DS and 2Ds (all on FW 9.2.0.20). I copied all files from my 3DS XL SD to my pc and then onto the SD cards of the 2 others, started Cubic Ninja (With Sky3DS) and got into the scan QR code section and the cubic ninjhax started right away and launched the hombrew browser, no need to scan the QR-code from the page, no download at all.
So basicly when you hack 1 console with Ninjhax and set it up, then you can just copy the content of that SD to another and you are ready on the other consoles, just start Cubic ninja and fire up the homebrew browser