Try getting activesyncmode from UTStarcomm. there are a couple ways to get it, but it will download and install with PIE. It fixes the unrecognised device error.
On the PDA, open Internet Explorer and type the address
http://www.utstar.com/pcd/downloads/...yncmode.sa.cab
Select “Save As” into Storage card or Main Memory, then OK,
it will automatically install to the device
After install, Close all programs on the device
Tap Start, then select Programs, and then Active Sync Mode
Switch from RNDIS to USB, then tap OK
Close all programs then Sync with your computer.