Mcu T5.3.19 Here

The version is a specific, widely used Microcontroller Unit (MCU) firmware for Android car stereos based on the Allwinner T3 platform . If you have an aftermarket Android head unit with 2GB or less RAM, bought around 2017-2019, it likely runs this MCU.

If the screen lags, a firmware/MCU sync is usually required. mcu t5.3.19