Default cannot connect to 802.11n network

I rooted and flashed my daughter's HTC evo shift 4g with jelly belly (jelly bean 4.1.2 see: http://forum.xda-developers.com/show....php?t=2024749) and all works well except for one thing. Her phone cannot connect to 802.11n networks now. It was able to do so when it was on the stock sprint rom. Any suggestions how to correct this would be greatly appreciated.