Lenovo S939 Update Kit Kat Vibe UI v1.5 + Gapps + Root - How to update Lenovo S939 with Vibe UI v1.5 Android Kit Kat 4.4.2, this guide will show you. Please remember if you follow this guide it can brick your device so please consider it. Android Kit Kat 4.4.2 already come for Lenovo S939, it called Vibe UI v1.5, the latest is version S939_VIBEUI_V1.5_1427_2_ST. This ROM only has EN and CN languages only and does not include with Gapps (Google Apps) but with this guide we will try to install this ROM, ROOT and Install Gapps, this guide is dangerous please consider it if you wanna follow it. Disclaimer : This guide for educational purpose only, We not responsible if your device bricked after following this tutorial. Downloads : S939_S129_140217 ↦ Required to login, This is CN firmware for Lenovo S939. Must install first, if your current firmware is ROW (Multi language) then your must download and install this. SP_Flash_Tool_v5.13448 MT65XX Preloader Vcom Driver Carliv Touch Recovery V2.4 ↦ Custom Recovery for Lenovo S939 Gapps Minimal for 4.4.2 Vibe UI Cleaner ↦ Application that use to remove un wanted chinesse applications. S939_VIBEUI_V1.5_1427_2_ST or S939_VIBEUI_V1.5_1423 ↦ Android Kit Kat 4.4.2 KingUser v3.3.6 Preparations : First thing i would recommend you is backup your current ROM, Use MTK Droid Tool to do full backup. How to Make Full Backup For Mediatek Device Backup your IMEI using MobileUncle MTK Tool, sometime flashing ROM become unstable and erase your IMEI. Back up all your file, because this guide will erase all save files on your device. Please install MT65XX Preloader Vcom Driver on your computer first, This need to install manually. Turn off your device and remove your battery, connect your device to your computer. When your computer ask for a driver please point it to MT65XX Preloader Vcom Driver extracted folder. After finish installation process please look at My Computer ↦ Manage ↦ Device Manager ↦ COM (Port & LPT). After your computer recognize your phone like above picture, now move S939_VIBEUI_V1.5_1427_2_ST or S939_VIBEUI_V1.5_1423, Vibe UI Cleaner, KingUser v3.3.6and Gapps Minimal for 4.4.2 to your sd card. for easy organize please place it on one folder. Disconnect your phone. Notes : if S939_VIBEUI_V1.5_1427_2_ST error and installation then change the files with S939_VIBEUI_V1.5_1423 this is an alternative ROM file with ROOTED and already include Gapps. so when you using S939_VIBEUI_V1.5_1423 file you don't not required to follow step 4 Lenovo S939 Update Kit Kat Vibe UI v1.5 + Gapps + Root Installing Official CN Stock ROM Lenovo S939 Extract S939_S129_140217 and SP_Flash_Tool_v5.13448on your computer, go to SP_Flash_Tool_v5.13448 extracted folder and run Flash Tool, if you are using windows 7 then run it with administrator privileges. On Flash Tool go to Options ↦ Download ↦ tick the DA DL All with Check Sum Now click on Scatter-Loading button and point it to S939_S129_140217/target_bin/MT6592_Android_scatter, wait for SP Flash Tool for loading and process the needed files to flashing. After all set, now click Download button or hit CTRL+D Turn off your device remove the battery and connect to your computer. If you successful install MT65XX Preloader Vcom Driver, SP Flash Tool will recognize your device and begin to start flashing process. Progress bar will be show on the bottom of SP Flash Tool. Flashing process will be take 5-6 minutes just wait until it pop up GREEN circle with Download OK information. Now you can disconnect your devices. Installing Carliv Touch Recovery v2.4 Installing carliv touch recovery is quite enough same with installing official CN stock ROM, but using the different files. Open and run Flash Tool, go to Options ↦ Download ↦ tick the DA DL All with Check Sum Now click on Scatter-Loading button and point it to CTRv2.4_S939/MT6592_Android_scatter, this will load only recovery.img to it recovery partition. After all set, now click Download button or hit CTRL+D The process will be same like before, now Turn off your device remove the battery and connect to your computer. SP Flash Tool will begin to start recovery flashing process the progress bar will be show at the bottom, and when it finish it will show GREEN circle with Download OK information. Now you can disconnect your devices. Now your device status is CN firmware with Carliv Touch custom recovery. Installing Vibe UI v1.5 1427_2_ST or Vibe UI v1.5 1423 Go to recovery mode, press and hold Power Button + Volume Up + Volume Down until your device show recovery mode. On recovery mode, Select Install zip from sdcard ↦ Choose zip from sdcard ↦ point to S939_VIBEUI_V1.5_1427_2_ST or S939_VIBEUI_V1.5_1423 , Carliv Touch v2.4 will begin flashing the S939_VIBEUI_V1.5_1427_2_ST or S939_VIBEUI_V1.5_1423 to your device. The process will take 2-3 minutes wait until completely finish. After finish, back to main menu again select Install zip from sdcard ↦ Choose zip from sdcard ↦ point to Vibe UI Cleaner this will remove un wanted chiness applications. Back to main menu again, if you wanna stop you can choose Reboot System Now but if you wanna install Gapps and Rooting your device, stay on the recovery mode and continued to next step. If you installing S939_VIBEUI_V1.5_1423 then this is the last step, don't need to follow Step 4 because S939_VIBEUI_V1.5_1423 already ROOTED and include Gapps Installing Google Applications and Rooting Now you on recovery mode main menu, Select Install zip from sdcard ↦ Choose zip from sdcard ↦ point to Gapps Minimal for 4.4.2. This will install Google Applications on your device running Vibe UI v1.5. When finish installing Gapps Minimal for 4.4.2, now back to main menu again and select Install zip from sdcard ↦ Choose zip from sdcard ↦ point to KingUser v3.3.6 this will root your device using KingUser v3.3.6 application. Finish, now your device already running Android Kit Kat + Include Gapps + Rooting Verified if your device already ROOTED with Root Checker download from Google Play Store Finish - Lenovo S939 Vibe UI v1.5 + Root + Gapps Thus guide is long, so please read careful when you wanna follow this guide. Leave any comments if you don't understand what you going to do. I hope this guide can help you solve your problems and please don't hesitate to leave any comments regarding this guide.