Usage scenario：B9 Box.
Press the update button through the hole written update below the box and unplug the power cord and hold the HDMI on the TV.
Keep the button pressed and plug in the power, release the update button until the “BTV” logo appears on TV and then the box will enter into the Android Recovery mode.
Choose “Wipe data/factory reset”, and then choose “Yes” to wipe all user data, like the images below:
After data wipe complete, choose “Reboot system now” to reboot the box, like the image below:
Reset finished and box enter the guide page normally, like the image below:
