Try the Recovery Mode Method using a different USB drive (under 16GB). Ensure the power supply is constant.
Contact the dealer or store where you purchased the unit. They can provide a Google Drive link to the specific build for your serial number. Alpha Coustic Update Firmware
Visit the official distributor website where you purchased the device, or look up trusted Android automotive communities (such as XDA Developers) hosting verified Alpha Coustic repositories. Try the Recovery Mode Method using a different
Try a different USB port or a smaller 8GB USB drive formatted to FAT32. Ensure the files are not inside a folder on the USB drive. Stuck on Logo Alpha Coustic Update Firmware