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[2in1GUIDE][JB] Unlock Bootloader and FASTER Root L9 Method

OP cmahendra

4th April 2013, 10:47 PM   |  #1  
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WARNING
  • USE INFORMATION AT YOU OWN RISK
  • There is no known perfect method to RELOCK the bootloader. So beware you will loose warranty of device. This warning is also shown while unlocking by LG.
  • This guide may have errors and may not work for some in various scenario. If you report them, I may try to correct them.
  • Read properly and DON'T SEND PM, I will simply ignore PM and laugh on you.
Just sharing information. See now how easy it is to flash+CWM+Root V20* on Unlocked Bootloader (UL BL)***

Thanks and Huge rounds of applause for Aremcee (aka RC or Ricardo Cerqueira).
This is completely based on Aremcee's Unlock and CWMRoot method as explained here. Please read is carefully before starting.
=============================================

Things to remember while proceeding.
  • Not for Newbies. (need some experience in flashing and installing fastboot drivers)
    .
  • IMPORTANT: You must have P760/P765 with P760 V20B EUROPE OPEN rom flashed on it....or OTHER UNLOCKABLE ROMS. @Gh0sT.RPG tried unlocking on P765 V20B, V20C & V20D all unsuccessful. But He unlocked on P65 V20A Indian in just 20min.
    .
  • You must have P768 with P768 JB (e.g.Mexico) Not tested but should work as per JB feature added in other variants. If this method does not work for P768 then try this method.
  • Phone might be already Bootloader Unlocked or you may Unlock it while in following process.
  • P769x owners please visit this thread for unlocking bootloader.
Unlock Bootloader and Easy Rooting of L9 P760/765/P768

0) Preparations:-

See post number 10 below for some information on fastboot drivers.

1) Connect phone to pc and change USB Mode to "LG Software Mode". Now wait for 30 minutes if you want to unlock bootloader (IMPORTANT Read post) and then open command prompt and give following commands in "lower case" because adb command is case sensitive.

Quote:

C:\>cd \android
C:\Android>adb devices

This should show the list of attached devices in ADB mode like shown below



Now pass this command and phone will restart in fastboot mode like this... in "lower case" because fastboot command is case sensitive.

Quote:

C:Android\>adb reboot oem-unlock

Phone will start in fastboot mode. You may be asked to install fastboot drivers at this point. See driver download from this this NEW download thread and install with instructions from this OLD install method or this New install Method.

2 A) AT THIS POINT, YOU CAN UNLOCK BOOTLOADER IF STILL LOCKED: You get option to press VOLUME UP key to unlock the bootloader permanently. If already unlocked, skip to next step.



2 B) When your phone comes in fastboot mode, then PC will install fastboot drivers, if not installed before. If automatic installation fails, you can manually install fastboot drivers as instructed in this post or this post. Strangely my device manager shows only one entry like this screenshot. (click for screenshot). If fastboot drivers are not installed this rooting will not work.



3) Now staying in Fastboot mode, install Recovery Software (CWM Touch) like shown below. All in "lower case", because fastboot command is case sensitive and will fail if you type carelessly.
Quote:

C:\Android>fastboot devices

This will show if phone is connected to your pc in fastboot mode or not by showing device entry result like "1234567 fastboot". Then give next command.
Quote:

C:\Android>fastboot flash recovery recovery-clockwork-touch-6.0.3.1-p760.img



This will install Recovery Software (CWM) in your phone. When finished you can disconnect phone from pc (remove usb cable).

To switch off phone, PRESS POWER FOR 15 SECONDS or REMOVE BATTERY and INSERT AGAIN.

4) Reboot phone in Recovery (CWM) Mode (with Vol+ and Home and Power button, all together for 5 secs) and flash UPDATE-SuperSU-v1.25.zip which was already copied before on sdcard. Reboot normally and enjoy.

Your are done.

For me everything went smooth in single attempt like a charm.


PS: The Rom I flashed before did perfectly worked well with all features and options Super Smooth as usual.
==============================================

EDIT: JUST FLASHED P765 V20D HongKong ON P765 INDIA WITH NO ISSUE. (14-Apr-13) See this related thread for more information

==============================================
Attached Thumbnails
Click image for larger version

Name:	FASTBOOT CWM PUSH.jpg
Views:	115954
Size:	24.2 KB
ID:	1858687   Click image for larger version

Name:	LG FASTBOOT MODE DEVICE MANAGER ENTRY.jpg
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Size:	22.4 KB
ID:	1858730   Click image for larger version

Name:	RomManager.jpg
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Size:	44.0 KB
ID:	1884100   Click image for larger version

Name:	Starting-in-Fastboo-mode-from-ADB.jpg
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Size:	18.7 KB
ID:	1884281   Click image for larger version

Name:	SHOWING_OPTION_TO_UNLOCK_BOOTLOADER.jpg
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Size:	62.9 KB
ID:	1889309   Click image for larger version

Name:	CWM-NON-TOUCH.jpg
Views:	3353
Size:	80.9 KB
ID:	1889311   Click image for larger version

Name:	FASTBOOT_MODE_WITH_UNLOCKED_BOOTLOADER2.jpg
Views:	136536
Size:	40.2 KB
ID:	1890088  
Attached Files
File Type: zip UPDATE-SuperSU-v1.25.zip - [Click for QR Code] (1.00 MB, 8340 views)
File Type: img recovery-clockwork-touch-6.0.2.9-p760.img - [Click for QR Code] (5.76 MB, 1089 views)
File Type: zip Android.zip - [Click for QR Code] (1.21 MB, 12243 views)
File Type: img recovery-clockwork-touch-6.0.3.1-p760.img - [Click for QR Code] (5.76 MB, 10678 views)
Last edited by cmahendra; 11th June 2014 at 02:50 PM.
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5th April 2013, 05:03 AM   |  #2  
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What different between v20b and v20c?
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5th April 2013, 09:29 AM   |  #3  
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Smile help
i have unlocked boot loader and when i try to flash kdz it shows no device foun ...i have installed the drives correctly..or can you give me the cwm backup?
5th April 2013, 11:36 AM   |  #4  
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Quote:
Originally Posted by hkfree

What different between v20b and v20c?

Not much. Everything seem same as V20B. Could be some minor unknown changes/bugfixes in the deep inside rom, which we may not want to know. But ROM is solid good and function well.

Actually at the moment, there is no solid reason with me for, why one should update to V20C? I am still exploring and trying to know whats difference lol

Quote:
Originally Posted by karthickkatta

i have unlocked boot loader and when i try to flash kdz it shows no device foun ...i have installed the drives correctly..or can you give me the cwm backup?

I wanted to but I have pathetic upload speed right now and it will take around 8/9 hours to upload 550+ mb CWM Backup. Practical not possible for me
Please wait for someone with FASTER upload speed.
Attached Thumbnails
Click image for larger version

Name:	V20C.jpg
Views:	93706
Size:	12.6 KB
ID:	1859829  
Last edited by cmahendra; 5th April 2013 at 11:45 AM.
5th April 2013, 11:46 AM   |  #5  
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Quote:
Originally Posted by cmahendra

Not much. Everything seem same as V20B. Could be some minor unknown changes/bugfixes in the deep inside rom, which we may not want to know. But ROM is solid good and function well.

Actually at the moment, there is no solid reason with me for, why one should update to V20C? I am still exploring and trying to know whats difference lol



I wanted to but I have pathetic upload speed right now and it will take around 8/9 hours to upload 550+ mb CWM Backup. Practical not possible for me
Please wait for someone with FASTER upload speed.

thanks ..but i flashed it succesfully ..another thing i cant see my pics or videos in the player ..what happened and i even did a factory reset ..
5th April 2013, 01:25 PM   |  #6  
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Couldn`t it improve battery life? For me on stock v20b with root is impossible stand more than 17 hours. Another thing whats bother me is wake up time from sleeping. When i press home or wake up button, it takes about 2 or 3 seconds to switch on display!!! And i didnīt change any frequencies or governor. I didnīt notice that problem on v10h ICS...
7th April 2013, 12:50 AM   |  #7  
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Quote:
Originally Posted by Manek66

Couldn`t it improve battery life? For me on stock v20b with root is impossible stand more than 17 hours. Another thing whats bother me is wake up time from sleeping. When i press home or wake up button, it takes about 2 or 3 seconds to switch on display!!! And i didnīt change any frequencies or governor. I didnīt notice that problem on v10h ICS...

Now its almost two days and approximately I got 1 and half day in single charge with moderate use. For me V20C is really better than V20B. Of course i use music and video very very less and mostly its for call and emails on 3G data.
Camera clarity is same (poor) as V20B but flash brightness is better than it.
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7th April 2013, 06:08 PM   |  #8  
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So far, I have found out, that there is different layout when you are answering call and maybe background in SMS app... In question of battery life, its too early to say.
11th April 2013, 11:30 PM   |  #9  
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command write failed unknown error
Quote:
Originally Posted by cmahendra

1) As usually I do, P760V20C Europe Open was out so flashed it on P765 India.

Then started phone in fastboot mode with following...



In fastboot mode my device manager show only one entry like this screenshot. (click for screenshot).

in this step yu have mentioned, can yu tell me the driver installed for the usb device connected in the screenshot - for me in the device manager it shows as some asus driver installed ... i guess maybe this is the reason for that command write failed error
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12th April 2013, 12:00 AM   |  #10  
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Quote:
Originally Posted by rkn989

in this step yu have mentioned, can yu tell me the driver installed for the usb device connected in the screenshot - for me in the device manager it shows as some asus driver installed ... i guess maybe this is the reason for that command write failed error

Asus? From where did you get that? Strange.

I am not sure right now, but these drivers problems are not occurring to me after I have installed Android SDK Tools (long time back) and installed original Google USB driver from Google Android Developers. See what items are installed in following image. And I think the platform tools and Google USB Drivers include FASTBOOT drivers too. Worked always for me.

Last edited by cmahendra; 14th April 2013 at 11:42 AM.

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