I bought it from Verizon with firmware 1.1.04.31.
http://opensource.actiontec.com/wcb6200.html
Shows that 1.1.10.20 is available.
It has been working fine for a while but recently the 5G bandwidth is giving me 14Mbps instead of 80. If I power cycle the WCB6200, then I can get 80Mbps again on IPad Prod. The next day it goes back to 14Mbps.