Use WinRAR or 7-Zip to extract the entire firmware into a folder (no spaces in folder path).
Very unlikely. The MT6572 chip has limited custom ROM support (max Android 6.0 unofficial). Stick to the stock firmware unless you have a proven custom ROM from XDA. sd mobile z200 flash file
Critical files for starting the device and entering maintenance modes. Use WinRAR or 7-Zip to extract the entire