Mmmm, I got my flashcartd here https://www.dwtechz.com/
How can I check for sure if the flashcard works or not?
I´v never heard of that website.. But that doesn't mean anything. I heard that there may be some shops selling fake/clones. Have you tried to email the people of sky3ds with your problem?
If you post photos of your card maybe someone can see if its a clone/fake, just a guess..