This firmware is based on W6HD 2.3.4 os,GB.f04ref.20111217,4.0.1 os,ICS.f04ref.20120130 and ICS.f04ref20111229 and so on os to upgrade.You can find your tablets' version by going to "Settings"--"About". Description: 1).Upgrade to Android ICS 4.0.3 version; 2).Add support of 3G dongles; 3).Improve activation from sleeping mode; 4).Hide the task bar when play videos on full screen; 5).Optimized the performance of native original browser; 6).Improve system stability and fix……