Constant high-frequency whine after update Cause: ANC filter coefficients corrupted or sample rate mismatch Fix: Downgrade to previous version (if allowed) or manually reset to anechoic defaults.
Once the download reaches 100%, the unit will prompt you to restart to finalize the installation. Method 2: Manual USB Firmware Flash
Navigate to your applications and tap Settings .
Once you have downloaded the firmware (usually a .zip or a folder containing files like update.img or 8227L.bin ), extract them. Copy the files directly to the of your USB drive. Do not put them inside a folder. Step 2: Connect to the Head Unit
: Export any custom settings or maps, as updates often factory reset the device. 📥 Downloading & Installation