The most common reason. Your device powers on but cycles endlessly through the "Quad-core" boot animation. This is often caused by a corrupted system partition or an OTA (Over-the-air) update that failed mid-installation.
Because official universal downloads do not exist, use trusted third-party developer communities and repositories to locate your specific update package: How To Update Your Android Head Unit + Apps Quad-core T3 P1 Update Download
Modifying your device's firmware voids any warranty (if one existed). The authors of this guide are not responsible for bricked hardware. The most common reason
Navigate to > System > About Device (or Car Settings > System Settings). Look for the System Version (e.g., V8.1.1) and MCU Version . V8.1.1) and MCU Version .