Installing the wrong firmware can "brick" your stereo (turn it into a useless, black screen). You must know your exact model number.

: Unzip the downloaded file and copy the update files (often named upgrade.pkg or similar) directly to the root directory of your USB/SD card. Do not place them inside a folder. III. Installation Process

: Format a microSD card or USB drive to FAT32 .

Failure to complete this section will void any troubleshooting potential.