Delete biosnds7.bin, biosnds9.bin and firmware.bin and redownload them from a different site. Create a folder named Firmware and put all 3 of those files in that folder. Don't forget to point the directories in Emulation Settings to the right folder and file. That is how I got mine working.I'm always getting either error 50000 or 50001. I don't have a wired connection (laptop) so i use VirtualBox to subsitute. In the Desmume OUTPUT Window, it says Firmware Config- Saved or something like that, but it still doesn't work. Any help?
EDIT: I got the wifi test to work, but when I try to go to the GTS in Pokemon Diamond, I enter, and it tells me to update so I update, but then I connect then it tells me I was disconnected from Nintendo Wifi Connection. (Error 54000) Any help?
Here is a photo: