Use the latest PC software (version V2.6 or above) for firmware upgrades.

PC Software & Firmware Download:

Visit: forum.avhzy.com

Go to the K2 page to download both the software and the firmware.

Upgrade Steps:

Press and hold the “-” (DFU) button on K2 while powering on. Do not release the button until the screen displays DFU mode. Once DFU mode appears, release the button.

Connect K2 using a USB-A to USB-C data cable or adapter to the CC1 port for the upgrade.

The software supports Windows only.

Recommendations:

Use a native USB port on the back of the motherboard (USB 2.0 recommended) for stable connection.

Avoid using USB hubs, extension cables, or some USB 3.0 ports, as they may cause connection issues.

Some data cables or adapters may not have proper D+/D– lines internally, which will prevent connection.