USB boot method: a. Format a USB 2.0 drive (up to 32 GB) in FAT32 mode on your PC/Laptop. b. Download the firmware and unzip it. (Recommended: WinRAR) c. Put "ISPBOOOT.BIN" into the root directory of the USB drive. d. Insert the USB drive into the Type-A port on the head unit. e. There's a small reset hole beside the Type-A port. Poke and hold it. f. Plug in the power. When "Updating" appears on screen, release Reset. g. When done, unplug power and USB. Wait 2-5 seconds, then plug in power to restart.

SD card / USB method: a. Format the SD card / USB 2.0 drive (up to 32 GB) in FAT32 mode. b. Download the firmware and unzip it. (Recommended: WinRAR) c. Put ALL unzipped files into the root directory of the SD card / USB (no sub-folders). d. Insert the SD card / USB in the head unit. e. Power on. Head unit runs the upgrade automatically and restarts when done. f. Remove and reformat the SD card / USB. (If left in, it will re-upgrade every boot.) If iPhone connection fails after update: Settings → General → Reset → Reset Network Settings.

Wireless CarPlay ARK app (JJK only): This ZIP contains the ARK app used to enable wireless CarPlay via the head unit's built-in Wi-Fi hotspot. a. Unzip on your PC. b. Follow the included README to install the app on the DU900. c. Pair your iPhone via Bluetooth first, then CarPlay will auto-launch.