Download RT stock firmware from here (based on device model number), flash it on your smartphone or tablet using a flash tool and enjoy the native Android experience again. If your RT device is bricked, flashing stock firmware is the only possible way to unbrick it.
Download RT Stock ROM Firmware
|RT Models||Android Version||Download Stock ROM|
|RT Rush||NA||Download Firmware|
|RT-Project Twist||5.1||Download Firmware|