No, he used the BIG-5 version of the 4.3a firmware, instead of the GB version.
I've -never- used the GB version of any firmware.
After all, big-5 is used in Hong Kong, and IIRC isn't that where the M3 team is based?
*edit* looks like you beat me to it.
So based on all of this, you're saying that if I did flash the GB firmware, my racing gears would stop working AND I would be unable to go back to 4.0 beta?
Boy that sounds like lose-lose...
I wonder if people losing their GBA saves is ALSO a cause of using the GB firmware ?