Flashcard shows menu?

I ordered this NDS Flashcard on Wish back then. At that time we tried different firmware until we got one that worked. Everything went smoothly for a while. All the games ran without any problems. After a while, suddenly nothing worked. Only a white screen with menu? Shown. Then I looked at the SD card and everything was gone. Then I just copied the firmware that was still on the laptop. However, it no longer works, even though it should be the right software.

Does anyone know what I can do?

Why you order memory cards or other technology on the wipe is a mystery to me. Heard that they have access to it and steal all data. I don't know if it works, but you can download the Nintendo 3ds operating system with a Windows PC and then copy it to your Nintendo. And please, please don't buy any technology for yourself.

It doesn't matter whether I buy a flashcard for 6 euro on Wish or for 30 euro on one of your sites. After all, I'm not one of those idiots who believe that the cell phone on Wish for 80 euro has a 200 Mp camera and 100,000 mAh. After all, my SD card is from Samsung and from the Media Markt. But that doesn't matter at all.

What exactly does that do for me when I download the operating system?

Doesn't it have to do with the firmware on the card?

Unfortunately I have no plan for the stuff.

Ah so then I got it wrong, I thought you had bought a memory card on wish and all stored things are gone, including the operating system.

That would be a thing o: But luckily, only the things that are on the SD card in the flash card are gone. Only now nothing works anymore: /

Maybe reset everything.