Updates for these "no-name" or Chinese head units are rarely delivered over-the-air (OTA). Instead, they are usually performed via a USB flash drive How To Update Your Android Head Unit + Apps
This is the safest and easiest way to update your device to the official "Top" (latest) firmware supported by your region. quadcore t3 p1 update top
If the system is currently working correctly, manufacturers often recommend not upgrading, as the risk of a "bricked" unit is high for these generic platforms. Updates for these "no-name" or Chinese head units