How to Flash:
Step 1: Download & extract the stock firmware on your computer.
Step 2: After extracting the files you will find the Firmware, Driver & instruction manual.
Step 3: Install the related USB Drivers skip this step if drivers are already installed.
Step 4: Follow the instruction manual to flash the firmware on your smartphone.
Download Rivo Phantom PZ15 Flash File Stock Firmware ROM
File Name: Rivo_Phantom_PZ15_MT6592_S004_20150121.zip
File Size: 858 MB