Without serial access, use a hardware programmer (e.g., CH341A) clamped onto the SPI flash chip. Dump the full 16MB or 32MB image.
Insert the USB into the head unit. The system should automatically detect the update. If it doesn't, navigate to Factory Settings (common code: 8888 or 1617) and select System Upgrade. How to Update Your Android Head Unit | Firmware/Build cvd1810wj firmware
The firmware is a common component of Android-based "Chinese" head units, often running on the MT8163 platform or appearing in CANbus settings for various vehicle integrations. Firmware Overview Without serial access, use a hardware programmer (e