[Optimus One, P500, V General] healthhome:
These are the steps I followed yesterdat night to update my Lg optimus p500 to Android 4. I have collected all these from different posts & Sites, So thanks to them who really made this possible. After reading lot of posts you might be confused about the steps & Base band. I m telling you a simple way-

STEP 1- Attach your phone to LG pc suit & update phone software so that by default your phone base band will be updated to 20_ . You can see it from settings > About Phone.

Step - 2 Root Your Phone.

1.	First of all, grab root package from the link ( http://depositfiles.com/files/lou8ae8uh )

2.	And download needed driver pack , and install on pc then reboot pc (http://depositfiles.com/files/a45wh9f07 )

3.	Enable usb debugging mode by going to settings>applications>developer on phone.

4.	Extract root.rar to safe place like desktop.

5.	Go to ADB folder , if you are on window 7 run cmd7.exe OR if you are using Windows xp then run cmdXP.exe .

6.	After starting cmd7 or cmdXP, type following commands in Red Color

adb devices

then

adb shell

(symbol will change to $ or #)

echo 1 > /data/local/lge_adb.conf

7.	After doing this, Reboot your phone

8.	Now go to root folder on desktop again, and start SuperOneClick.exe

9.	Select GingerBreak method and press root button

10.	Wait few seconds and its done.

STEP- 3

1.	Install Rom Manager from market on phone.

2.	In rom manager application Click on install clockworkmod..

3.	Boot Your Phone in Recovery Mode (Volume Down + Home + power Key)

4.	Go to the main recovery menu and follow the below steps one after another to wipe data, cache and system.

‘Wipe Data/Factory Reset’ –> Yes

Mounts and Storage’ –> Format /system –> Yes.

‘Mounts and Storage’ –> Format /boot–> Yes.

‘Advanced’ –> Wipe Dalvik cache –> Yes

5.	Switch off Phone & Remove memory card.

Now You are going to install rom-

6.	Put the Rom & Gapp files (You can download from Here http://xdaforums.com/showthread.php?t=1614420 ) on your SD Card’s main folder (With help of card Reader) for easy navigation since the recovery mode is tough to navigate with hard keys.

7.	Put memory card back to phone & Reboot the phone in recovery mode again, After this choose install zip from sdcard option

8.	Select the ROM (the same file that you just downloaded, beta_testing.zip) to install – your ROM will begin to install.

9.	Once installed press the back button few times to go back to the main screen of Clockwork Recovery.

10.	Choose reboot system now

11.	Reboot Phone in Recovery mode & again install Gaapp app from sd card similarly & Reboot phone again.

People who wants exter like SD partition

WARNING!

THIS WILL DELETE EVERYTHING!

(SD CARD AND YOUR CURRENT ROM)

I am going to explain how to partition your sdcard for more user app memory..

This will give you about 1GB of storage to store more apps on!

1. Backup everything from your sd card and apps

(this will format your sd card and apps)

2. Boot into clockworkmod

3. Go to advance

4. - Partition SD Card

5. - 1024M (1GB)

(recommended for smaller sd cards)

6. - 0M

After this step the phone will just sit there for a while just leave it alone and it will say done when it's done!

Important!

- Wipe Dalvik Cache

- wipe data/factory reset

- wipe cache partition

Reboot your phone/ or install a custom rom (your choice as described above)

Download Link2SD from the market

Run Link2SD and a thing should pop and click on ext2 then reboot the phone..