Flash Guide How to Flash a ROM to Your Android Phone
These are the instructions to download Flash or install Stock Firmware (ROM) on Long M3 Plus (Original firmware) , If you searching for the Long M3 Plus Stock ROM then you are at the right place. Here i will guide you to install official stock Rom on Long M3 Plus , Here you can download the Official Long M3 Plus Stock Firmware ROM (flash file) on your Computer.
DownloadLong M3 Plus Stock Rom (Original firmware)
Requirements: Your Long M3 Plus Device should have at least 40-50 percent of battery to perform the Flashing Process.
Flash File Name: Long_M3_Plus_V01_20170227_6.0_SPD-[flash-file.net].zip
Flash File Size: 674 MB
Flash Tool Link: SPD Flash Tool
How to Flash Stock Firmware ROM on Long M3 Plus
To install the Stock Firmware on the Long M3 Plus , Please follow the guide and download the Rom . This guide is for How to Install Stock ROM on Long M3 Plus .
Step 1: Download and Install Long M3 Plus USB Driver on your Computer. If in case Spreadtrum Driver is already installed on your computer then SKIP this Step.
Step 2: After Download Stock Rom (pac) for your Long M3 Plus Device.
Step 3: Download and extract Spreadtrum Upgrade Tool on your computer. After extracting, you will be able to see the following files:
Step 4: Now, open UpgradeDownload.exe.
Step 5: Once Spreadtrum Upgrade Tool is launched, connect your Long M3 Plus Device to the computer (make sure your Android Device is switch off).
Step 6: Once your Long M3 Plus is connected successfully to the computer, click on the Load Packed Button and add the .pac file (stock rom which comes as .pac).
Step 7: Once you have successfully added the Pac file in Spreadtrum Upgrade Tool, click on the Start Downloading button to begin the flashing.
Step 8: During the flashing process your Long M3 Plus Device will restart automatically. Once flashing is completed, you will be able to see the Green Passed Message in Spreadtrum Upgrade Tool. 
Step 9: Now you have successfully flashed your Long M3 Plus using Spreadtrum Upgrade Tool. Once your Long M3 Plus Device is successfully restarted, Go to Settings About Phone Check firmware..
Congratulations, Now you have successfully flashed the stock firmware on your Long M3 Plus using Spreadtrum Upgrade Tool
Keep in mind:
[*] Long M3 Plus Flash Tool: If you need to download the latest version of SPD Flash Tool, then head over to SPD Flash Tool for WINDOWS .
[*] Backup Please: Take a backup of your important data before Flashing Long M3 Plus Stock Firmware as because during the flashing process your personal data will be removed permanently .
[*] Broken link Report here.
[*] ROOT Long M3 Plus:If you would like to know how to root your Long M3 Plus android device, drop a comment below. We will share the tutorial for your device as quickly as possible .
