LG F100L/S Jellybean Upgrade, Root, Khmer Unicode and Clockwork Mod

Khmer version, click here.
UPDATE: Link is repaired. Thanks for the feedback. If you find dead link, please comment to let me know.

LG F100

For LG Optimus Vu F100L or S only. F100L is a Korean variant, and S is international variant. Your phone must have a battery that may last 1 hour or at least 20%. Rooting and changing system file void your warranty. I tested this on my LG Vu F100L and got success even on a repeated demo. However, I do not have guarantee for your phone if it bricks. Do it at your own risk. Anyway, if you do just exactly as I write here, I believe you will succeed.

UPDATE: If you already on official Jellybean 4.1.2, you can skip the upgrade and go straight to root.

Goals:

Upgrade Android Jellybean 4.1.2 (Regardless your current version)

Root

Install Khmer Unicode fonts and keyboard (you can skip this)

Optional: Install CWM recovery and boot into CWM recovery mod

Sources

Tinhté

Ra168 Blog

Cambodroid

Requirement

PC internet for download (around 750mb of data), UPDATE: This tutorial can work completely offline as long as you already download all required files in advance. 

Mobile internet (WIFI or cellular data) (around 1mb of data)

Difficulty: Moderate

Duration: Approx. 30 minutes (exclude download time) 

Files to download (Click to download)

1-​ Official ROM: Jellybean 4.1.2 (Skip if you are already on official jellybean 4.1.2)
Choose your device. If you are not sure, check in your phone "Setting" -> "About Phone" and look for device name.

            For F100L

            For F100S                        If not work, please use the LG ROM searcher. Click here for it.

2- LG Driver

3- Upgrade tool: AIO_P990_Toolkit

4- LG Root Tool (CWM, Titanium Backup, Root Explorer included)    |             Mirror

5- Khmer Unicode Fonts
NOTE: As of some people are experiencing difficulty to update their Jellybean (B2C App required, I have made alternative to the bottom of the tutorial. Thus, below are the required files for the alternative tutorial:
You would need LG Driver, Firmware (above), Flash tool, B2C App, Windows Enabler (link is below).
Though, this needs PC internet.
6- Flash tool, B2CApp, Windows Enabler             |           Alternative (4shared)
7- B2C App     |         Alternative (Mediafire)

Tutorial

In Video (text below)

A- Upgrade to Jellybean 4.1.2

NOTE: If you experience B2CApp requirement, please, follow the upgrade tutorial on the bottom of this tutorial.

UPDATE: Skip if you already on 4.1.2, and go straight to root section below in step B

- Extract LG United Mobile Driver, AIO P990 toolkit and LG Root Tool

- In folder "LG United Mobile Driver", launch "LG United Mobile Driver"

- Click "Next" when asked, and then wait for installation to finish 

- Back in folder "AIO P990 Toolkit", launch "AIO-ToolKit.cmd"

- Type "6" and then "C"

- On "Select Type", choose "3GQCT". On "Phone mode", choose "Emergency"

- On "Select kdz file" locate and choose the downloaded ROM

AIO Upgrade Toolkit

- Turn off your phone. Hold Vol + Button while connect USB cable to your phone until it display "Download" mode.

- Wait for driver installation to finish. Click "Normal upgrade test"

- Click Upgrade start

- Choose country, and click OK.

- Wait for "S/W Upgrade Complete!" status (for around 15 minutes). On 96%, your phone will reboot itself. It's just a normal process. Leave it there. 

- Done!

B- How to​ Root

UPDATE: If you are already on official Jellybean 4.1.2 and would only want to root, you can begin here.

1-    On your phone, go to "Setting" then "Security" and check "Unknown Sources".

2-    Again, go to "Setting" then​ "Developer" and check "USB Debugging"

3-    Once again, in​ "Setting", go to "PC Connection" and on "USB Mode", choose MTP

4-    Plug your phone to USB

5-    Launch LG_Root_Pack.exe

6-    It will do the job itself. Wait for Press any key to continue… then press a key on your keyboard.

7-    Phone will reboot

8-    Done

C- Installing Khmer Unicode and ClockWorkMod Recovery

UPDATE: Note if you do not wish to install Khmer Unicode and want to go straight to CWM Recovery installation, please, skip step 1-3, thus begin from step 4 until step 6.

(For CWM Recovery installation and reboot to recovery mode, read step 4-6, and forget about step 7 onward)

1-    On your phone, in "Setting", go to "PC Connection", and on "USB mode", choose "Mass Storage".

2-    Plug your phone to PC

3-    Copy Kh F100L 4.1.2.zip to your phone (leaving it in its ZIP form)

4-    On your phone app, launch "2nd-Init Recovery"

5-    Tap "Install 2nd-init CWM Recovery" and then tap "Reboot recovery"។

6-    Phone will reboot itself to CWM Recovery Mode

7-    Using volume buttons to scroll and power button to select. Choose "install zip from sdcard" and then "choose zip from sdcard" and locate "Kh F100L 4.1.2.zip" and select "Yes – Install Kh F100L 4.1.2.zip". Wait until it finishes.

8-    Select "Go Back" then "Reboot System".​ Phone will reboot.

9-   Search for Phum Keyboard in Play Store and install it.

10- Enable Khmer keyboard by going to "Setting", then "Language & Input", check "Phum Keyboard" and make Phum Keyboard a default keyboard.

11- Done

Congratulation on your LG Vu Jellybean 4.1.2. Link dead? Comment below

Alternative method to Upgrade Jellybean (PC internet required)

1- Install USB drivers (Like in the normal method; use LG United Mobile Drivers: Link above)

2- Plug your phone to USB and wait for driver installation to finish.

3- Open B2CAppSetup.exe and let it run for a moment until you see a new windows that has "Install Driver". Don't click it.

4- Open Windows Enabler.exe, then click on a small icon on the notification bar (near clock, on the bottom right of monitor) to set to "ON"

5- Now, open UpTestEX.exe.

6- On "R&D Test Tool" Window, please specify exactly as:

• Select Type: 3GQCT
• Phone mode: DIAG
• Select KDZ file: locate the firmware

7- Then click "Normal Web Upgrade Start"

The upgrade will run as the original tutorial.

Then, root your phone using normal method above.

Enjoy.