Agree. Follow that guide and you'll be mint. I still use my GW blue card for my DS needs tho.If you're thinking about getting a Gateway, no need. You can do everything it can by following this guide:
https://3ds.guide/
For 9.9 you'll be using soundhax now I think.
If you have a Gateway and wondering if there is a way to use that, I think there is. But it's a bit old-fashioned now.
You have likely been scammed. You could have done everything gateway could have done for free by using this guide. https://3ds.guide/Thanks for all your help i used soundhax and downgradeded my firmware to 9.2 and now i am waiting on my gateway card