In the next weeks there should be multiple other firmware releases for the devices that are currently running only the Ice Cream Sandwich. (android.gs)
Any alterations such as upgrades, modding with custom ROM, rooting or flashing the Android device with other firmware will automatically cause the device experience matters as well as void the device's warranty. (ca.dhgate.com)
Special notes on installation, operation, making it work on other firmwares, stuff like that, anything to make life easier. (mobileread.com)