Updating the YT9213AJ typically involves flashing the unit using an OTA update via USB or a PC tool called (used for deep/brick recovery). Based on the most reliable methods from Android head unit communities:
: Format a 16GB or 32GB thumb drive entirely to FAT32 format. yt9213aj firmware update better
: Use a high-quality USB 2.0/3.0 drive formatted to FAT32 . Updating the YT9213AJ typically involves flashing the unit