In Order To Flash STOCK ROM we need1. LENOVO USB DRIVER
2. SP FLASH TOOL
3. VCOM PRELOADER DRIVERS
4. USB CABLE
5. LENOVO K3 NOTE PHONE
1. First download Lenovo USB driver which supports Lenovo K3 Note.2. SP Flash Tool V5.1524.00 3. VCom Drivers and also Driver Auto Installer.Procedure:1. Download SP Flash Tool and STOCK ROM contain all in in one link of K50a40 and K50-T5
2. File Preparation Unzip or UnRar all the above file you downloaded.
3. Enable USB Debugging
Go to Settings >> About >> Build number and tap it 7 times to unlock Developer options.Then return to Settings>> Developer options and tick the USB Debugging option.
I had taken 1614 ST as an example here.
Step 1. Extract the Downloaded files on your Laptop/PC.
Step 2.Install LenovoUsbDriver_V1.1.14 On your PC and after the Installation Restart your Laptop/PC.
Step 3.If u already did a backup of your important Data Power Off your Device.
Step 4.Run the Sp flash tool(Its inside the Zip file with the Rom that u downloaded)
Step 5. Now navigate to Option/Download/General setting/DL DL All with checksum Tab and check USB Checksum and EMMC checksum like in the picture down bellow and after setting that up click on X.
Step 6.Now from "Download" Tab click on "Scatter-Loading" and Navigate to the Scatter-Loading file(it should be like this path Your PC\K50-T5_USR_ST1614_5.294.1_1604011150_mp1V2.39_CN\targe t_bin\MT6752_Android_scatter)see picture below
Step 7.Once you Hit Open on the MT6752_Android_scatter a Procesing window will pop up(see picture bellow) Loading the necessary files for Flashing(its about 30sec-1min sec depending on your PC configuration)
Step 8. Now Click On Download Tab and Set Firmware Upgrade.
Step 9. Now Connect your Phone(Turned Off) To the Pc/Laptop using Usb cable and wait about 10-15 for the Flashing Process
Step 10. Once the Flashing Process is completed a Green pop up window will appear.
Step 11.Close the SP flash Tool and disconnect your phone from the Pc/Laptop
Step 12. Turn on Your Phone and wait about 10 mins for the further instalation
Step 13. Congrats You have the Last stable K50-T5_USR_ST1614_5.294.1_1604011150_mp1V2.39_CN version installed.