How to hard reset LG Optimus One P500?  You can refer to the LG Optimus One p500 user manual or see the following instructions.

Use Hard Reset to initialise you phone to the original condition.Turn on the phone by pressing and holding Power + Home + Down volume key at the same

time (for 10 seconds),  (more…)

Now all LG Optimus One users can get an official update to Android 2.2.2. This upgrade fixes some bugs which exist in the Android 2.2.

This is the direct download link:

LG Optimus One Android 2.2.2 Firmware update download;

http://csmg.lgmobile.com:9002/swdata/WEBSW/LGP500/AVDZBK/V10q_00/V10Q_00.kdz

Please click on the link above to download the LG Optimus One Android 2.2.2 Firmware.

If you want to root your LG Optimus GT540 running 2.1, please refer to the following steps:

1. Enable USB Debugging Mode…
2. Download “z4root” from the Market…
3. Open the app, click the ‘root’ button

Z4root can be download from the Market, or here:
http://rapidshare.com/files/441570708/z4root.1.3.0.apk

Here are the steps to perform a factory reset on LG Optimus V：

1. Press “Home” > Settings >Privacy >Factory Data Reset

2.  Read the message stating the types of data that will be deleted, then tap Reset Phone.

3.  If you are certain that you would like to restore all factory settings, tap Erase everything. Your phone will reset to the factory settings.

You can also do so：

1. Turn off your LG Optimus V.

2. Press and hold the following keys for over 5 seconds: Down volume key + Home
+ Power

3. When the power turns on, release these keys.

LG Optimus One arriving on Virgin Mobile as Optimus V, LG Optimus V Manual PDF file has been published on the  official website.  The user guide of  LG Optimus V will  help you to enjoy all the functions, features and Apps of the LG Optimus V.

You can direct download the LG Optimus V  User Manual by clicking on  the following link :

LG Optimus V  User Manual/Guide Download ;   ( English 3.6M PDF )

This above link is from the Virgin Mobile  official website.

Hope the Owner’s manual of LG Optimus V is useful to you.