For stability, stick with Android KitKat. The Lollipop ROMs for this chip are notoriously buggy.
Maya stared at the screen. The RK3128 had no Wi-Fi. No Bluetooth. No camera. No microphone. Only the faint, latent heat of four anemic cores processing the loop. She typed: rk3128 mxq ep 68
You can find the for as little as $15 to $20 shipped. For the price of a pizza, you get a complete computer. If you break it, you don’t care. For stability, stick with Android KitKat