I've successfully managed to install CMONEX HardSPL.
The steps on the
cmonex's original post are correct, however it fails to mention that you will not be able to establish an ActiveSync connection, but the "
Qualcomm CDMA Technologies MSM" connected to "
Microsoft USB Sync" in, in fact, what you should wait for.
The installation on my Treo was successful as the pictures below can attest.