Step 1: Download the Lollipop 5.1 ROM
Step 2: Download SP Flashtool. After downloading it, extract it to your desktop then launch the .exe file inside called “flash_tool.exe”
Step 3: Download VCOM tools.
*First disable Driver Signature enforcement on Windows 8,8.1 and 10.*
*Then install the necessary drivers.*
*This is very important. Nothing will work without setting this process up properly.*
After setting up the VCOM tools, you need to launch the flash tool and then:
Step 4: Click on Scatter Loading.
Step 5: Look for a text file from the ROM you had downloaded called “MT6592_Android_scatter.txt”.
Step 6: Wait for the SP Flash tool to compile its own stuff.
Step 7: Select Firmware Upgrade option.
(Before continuing, you need to go to your device. Go to settings –> Developer Options –> Enable USB debugging. If you don’t see Developer Options, go to About Phone and click on Build Number until it says “You’re now a developer”.)
Step 8: Enable Debugging.
Step 9: Remove your phone SD card.
Step 10: Switch off the phone and pray everything works.
Step 11: After switching off the phone. Go back to your computer.
Step 12: You are on the SP Flashtool Window. Click on the Download button.
Step 13: After clicking on Download button connect your phone with the computer through the USB cable. Wait for the magic.
(You will only be done when you see a big White Tick on a Greenish-Yellow background. Otherwise don’t remove/disconnect phone from computer.)
Last Step: Reboot. (It will take quite some time to reboot. Be patient.)