There was a news announced by Adobe few weeks back that it will not release a Flash Player version for the Android version Ice Cream Sandwich. This was come as a bad news for some people who, after all the hate that Flash got still loved it. But, if you have updated to the Android Jelly Bean 4.1 version and you cannot have access to the non-HTML5 parts of web then there’s nothing to make a fuss about, the XDA developers are here for you.
All you need to do is to download the Flash Player APK, which you can find links at the XDA forum thread. After downloading, install it with a file manager to make sure the plug-ins are enabled at the browser.