Pantech Duo offers up WM6.1
AT&T Pantech Duo customers…go and get it…
Pantech Duo Windows Mobile 6.1 Standard
CE OS 5.2.19597 (Build 19597.1.1.8)
Radio Version C819.33.
OS Bld. Version 6.11.M044.33
RIL Version 2.02
SW Release Date: September 29, 2008
Download File Size: Approx. 58 Mbytes.
Available storage space required for use: Approx. 90 Mbytes.
http://www.pantechusa.com/html/images/software/download.htm