If you are still on the ZV8 Firmware you will need to update to ZV9 before you can update to ZVB
LS996 ZV9 Sprint -> ZVB OTA update.zip
Software version LS996ZVB All Android security: level patch 5.1.1 01.05.2016 LMY47S
LG Flex 2 software update - version LS996ZVB
All April Google Security Fixes
How To install Update:
- You CAN not apply this update if your device is rooted. You a must BE running a stock image without Root.
- To install the firmware update, Simply copy the downloaded file to the root directory of your the SD card.
- Reboot Into bootloader.
- If you have the adb installed, you can also try this command "adb reboot bootloader"
- Or you can just power off your device , and hold Volume Down and Power buttons together and press the power button. After about 5 seconds, you will be in recovery mode screen.
- Now, select "Apply update from sdcard"
- Use your power button to select the option.
- Then Select the "update.zip" file you have downloaded from the list
- the Enjoy!