I know I'm four years late to the party but about a year ago I found a cheat device on Xianyu that happened to have the English name "Fire Bird" on it, which I suspected to be the elusive Vast Fame cheat card. As it would turn out, Ankos already bought the listing by the time I mentioned it on the BGC Discord. After it arrived they pretty much confirmed that it was at least connected to the Fire Bird ROM that's been dumped online, with its ROM header sharing the same name as the one in the common ROM ("VAST FAME 1.0"). Unfortunately Ankos couldn't get their unit to work and later discovered that the pins for the connector on the cartridge were bent. The ROM they dumped from the cartridge also didn't work on emulators when they tested it, which they suspected to be copy protection. Personally I still have more questions than answers about that cheat card after refreshing my memory of that whole experience, but hopefully one day more of this mystery can be put to rest.
From the last time I was able to freely search for stuff on Xianyu, the Fire Bird cheat cards aren't terribly rare but they definitely seem uncommon in mainland China at least. If I had to describe what it looked like, it looks similar to a Gameshark but it uses a translucent blue shell. I'll attach pictures of the cartridge that I downloaded from a Xianyu listing on this post.
