Insert a toothpick into the to press and hold the hidden reset button.

Verify:

In USB Burning Tool, “Connect Success” will appear, and an image of a blue braid will animate. You do NOT need power to the box at this stage (the USB port provides enough power for flashing).

There are two primary ways to handle a USB-based update, depending on whether you are doing a "local" update or a deep system "flash."

Box reboots to Android with new build number.