I had a similar problem. I have an R4i Gold with the 3DS sticker and it shows Chessmaster. I also thought it was supposed to work on 1.4.3 but it didn't. So I figured I had a non-3DS card and updated it using the non-3DS update on r4ids.cn and it was no longer recognized.
I used an another...
But Nintendo's GBA video format is different, being that it uses a custom ROM and chipset for rendering, for like the Shrek and Shark Tale titles. Been undumpable for years and years.