iBowToAndroid posted this a few days ago, here is the official page from Sprint.
You must have stock recovery to run this update.zip successfully.
ZVD update.zip
ZVD downgrade details
You must have stock recovery to run this update.zip successfully.
ZVD update.zip
ZVD downgrade details
Code:
LG Optimus S™ Froyo Software Package
Download the latest Froyo software for the Optimus S.
Note: Performing this system update will result in a device reset, removing all contacts and account information. To retain your contacts, please visit a full-service Sprint store to perform this update.
Follow these instructions to install the Froyo software:
Make sure your device has a full charge before performing this update.
Make sure you have an SD card in the phone (go to Menu > Settings > SD Card & Phone Storage).
Download the file "update.zip" to your PC Desktop.
Connect your LG Optimus to your PC via the micro USB cable and select the option to "Turn on USB Storage".
Open the folder to view files on your device and place "update.zip" from your desktop onto your SD card.
Once the file is copied, turn off the USB storage on the device, disconnect the device from the PC and power off the device.
Now press the Volume Down key, Home key (on the front of the device), and Power key simultaneously for 5-10 seconds until you see an Android recovery screen.
Navigate on the screen with the Side Volume keys to highlight the second option, "apply sdcard:update.zip".
Press the Menu key on the front of the device after highlighting that selection to begin the software installation.
After 2-3 minutes, select "wipe data/factory reset" using the Side Volume keys and press the Menu key to select this option.
Highlight the line "Yes -- delete all user data" by using the Side Volume keys and press the Menu key to select this option.
Press the Volume Down key to highlight "reboot system now" and press the Menu key to select this option.
The update process should automatically power cycle the device.
Once rebooted, verify the process was successful by navigating to Menu > Settings > About Phone and confirm the software version is "LS670ZVD".
If you experience any issues performing this installation, please visit your nearest full-service Sprint retail store for assistance.
Technical Specifications:
Dated: 10/03/2011
Software Version: LS670ZVD
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