Requirements: Your Android Smartphone should have at-least 30-40 percent of Phone Battery to perform the Flashing Process.
Step 2: Power Off your Device.
Step 3: Now Enable AP Mode on your Android Smartphone. To Enable AP Mode: Press and Hold Power Key and Volume Up Key for 5-8 Seconds until AP Mode is enabled.
Step 4: Now, Connect your Smartphone to the Computer using USB Cable.
Step 5: Download the Stock Rom or Custom Rom that you want to Flash on your Android Smartphone and extract it on your Computer.
Step 6: Download and Extract Qualfast Software on Your Computer. After Extracting you will be able to see the following files:
Step 7: Now Open Qualfast_1.0.1.exe.
Step 8: Once Qualfast Software is launched, Click on the Set Path Button from the Right.
Step 9: Now, Locate the Firmware Folder (that you have downloaded for your Device in Step#5).
Step 10: Once you have added the Rom correctly, the AP Path in the Qualfast Software will be set automatically and the Info Boxes will become Blue.
Step 11: Now, Press on the OK Button to begin the Flashing Process.
Step 12: Once Flashing Process is completed, you will be able to see Green Box.
Step 13: Now, Close Qualfast Software on your Computer and Disconnect your Smartphone from the Computer.
Step 14: Restart Your Device.