Please ensure to charge your phone's battery to at least 20% (30% and above is recommended) before using this guide.
How to use Broadcom MultiDownloader ToolStep 1: Download and extract Broadcom MultiDownloader Tool and Drivers. After Extracting, you should see the following files:
Step 3: Shutdown / turn off your Android Device.
Step 4: Extract the content of your downloaded stock ROM (if it's in zip, rar, or other archive extension) to your Computer.
Step 5: Run Broadcom MultiDownloader.exe from the folder you extracted it to.
Step 6: Once Broadcom MultiDownloader Tool is launched, Click Settings and select the Configuration.
Step 7: In Configuration panel, click on [...] button and select the firmware folder.
Step 8: Now you have successfully added the firmware folder in Broadcom MultiDownloader tool. Click on Apply button to continue.
Step 9: Connect your Android Device to the Computer (while it is turned off, press Volume UP and Down at the same time, then connect to Computer via USB cable).
Step 10: Once you have successfully added the Android Device to the computer then Broadcom MultiDownloader Tool will detect and display it.
Step 11: Now, Click on the Start All Button to begin the Flashing Process.
Step 12: Broadcom MultiDownloader Tool should now commence the firmware flashing process. Wait for it to complete and do not interrupt.
Step 13: Once Flashing is complete, a green OK notification should popup.
Step 14: Close Broadcom MultiDownloader Tool, disconnect your device from the computer and boot / power on the phone.
..and you've successfully flashed your device's stock ROM. Congratulations!