Tap or Online Upgrade . If a version is found, click download and allow the system to restart automatically once finished. Local (USB) Update : Preparation : Format a USB flash drive to FAT32 .
If successful, you will see the Android system recovery menu (blue text on black background). Use Volume Up/Down to navigate and Power to select. android yt9216bj00012v001 update full
After the install says "Install from USB complete," do not reboot yet. Tap or Online Upgrade