You can use the scatter file to "read back" or dump your existing firmware before making changes. How to Use the MT6833 Scatter File
SYSTEM = SYSTEM, START = 0x01B80000, SIZE = 0x40000000 Mt6833 Scatter File
But before you throw the phone in the drawer or rush to a repair shop, there is a powerful tool in the Android modding world that might just be your savior: You can use the scatter file to "read
CUSTOM = CUSTOM, START = 0x00000000, SIZE = 0x00000000 START = 0x01B80000