Reupdated my Optimus 7 to sweet mango after finding solution to previous 0x81030120 error when trying to sideload Advance Config. So now my Optimus 7 is Mangoed & Unlocked.
LG sure rocks since IMO among all WP7 phone it's the easiest to unlock. Don't even need to download any XAP or other apps to unlock it. And it also can be done after you have update to Mango.
Anyway below is how to unlock you LG Optimus 7, thanks to people at XDA.
Just one note, if u want to update to Mango best do it after 1AM since it's really slow downloading the update in day time. Last time the whole process only took me less than 1 hour, today it's more than 2 hours.
Click
here for original link.
LG
1. Install the MFG app by dialing: ##634#
2. Open the MFG app. The password is: appmfg#*#
3. Go to Engineer Menu -> Other Settings -> Edit Registry
4. Set your ROOT PATH to "HKEY_LOCAL_MACHINE"
5. Set your input path to "\Comm\Security\LVMod"
6. Set your input key to "DeveloperUnlockState" and set to DWORD.
7. Leave input data box empty and tap "SET".
8. The output should be 0.
9. Now enter "1" in the inputbox and tap "SET".
10. The output should be 1.
11. Set your input path to "\Software\Microsoft\DeviceReg"
12. Set your input key to "PortalUrlProd" and set to DWORD.
13. Clear the input data box and hit "SET".
14. Output result should be "0".
15. Set your input key to "PortalUrlInt" and set to DWORD.
13. Clear the input data box and hit "SET".
14. Output result should be "0".
15. Set your input path to "\Software\Microsoft\DeviceReg\Install"
16. Set your input key to "MaxUnsignedApp" and set to DWORD.
17. Clear the input data box and hit "SET".
18. The output should be 0.
19. Now enter "2147483647" in the inputbox and tap "SET".
20. Output result should be "2147483647".
Good luck.

My Optimus 7 info b4 and after update.
OS Version: 7.0.7392 = nodo
Firmware revision number: 1.0.1.10
Hardware revision number: 1.0.0.0
Radio software version: 1.0.3.10
Radio hardware version: 0.3.5.0
Bootloader version: 1.5.1.0
Chip SOC version: 0.30.2.0
OS Version: 7.0.7403 = pre mango
Firmware revision number: 1.0.1.10
Hardware revision number: 1.0.0.0
Radio software version: 1.0.3.10
Radio hardware version: 0.3.5.0
Bootloader version: 1.5.1.0
Chip SOC version: 0.30.2.0
OS Version: 7.10.7720.68 = mango
Firmware revision number: 1.0.3.10
Hardware revision number: 1.0.0.0
Radio software version: 1.0.3.10
Radio hardware version: 0.3.5.0
Bootloader version: 1.5.1.0
Chip SOC version: 0.30.2.0
It seems that firmware is also updated.
This post has been edited by karipuff: Oct 4 2011, 08:30 PM