The firmware is identical between the 32-bit and 64-bit drivers. Make sure you are using the "approved/supported" firmware. There are only a few versions. If it extracts with the right extraction tool, it is supported.
Trever
btw: i'm running x86_64 and i'm pretty sure the firmware was for the 32-bit version.
thanks,
Eric
-- "Honor isn't about making the right choices. It's about dealing with the consequences." -- Midori Koto