B2017GV1.2.0B15 Nougat 7.1.1 firmware download, with step by step instructions on how to install:
*2) Unzip the ZIP file one time.
*3) Inside there is another ZIP file called "update.zip".
*4) Put the "update.zip" file directly on the root of your SD card (meaning Not in any folders on your SD card) (! do Not unzip "update.zip" or your phone will Not detect the update).
*5) Search for updates in the settings.
* Download link: