Read the update at the bottom
(18 SEPTEMBER 2011)
Before installation, uninstall all LG's programs and drivers from your computer.
Tested on Windows XP.
Download all these files.
LGFLASHTool 1.2 http://forum.xda-developers.com/show...&postcount=107
Thread with Optimus 3d Roms in *.bin format. http://forum.xda-developers.com/show....php?t=1246678Thanks to nasirahmed
1.Extract "Setup_LGFlashTool_1.1.zip" and Install.
2.Extract "file.zip" and put "LGFlashTool.exe" to location where you installed "Setup_LGFlashTool_1.1.zip" (default: C:\LG\LGFlashTool\)
3.Extract and Install "OMAPFlashInstaller-4.10(2).zip"
4.Exract "LGUnitedModemDriver_WHQL_ML_Ver_4.9.7_All_Win7_LG EAll.zip" and Install "LGUnitedMobileDriver_S497CA20_WHQL_ML_Ver_1.0 .exe " and "LGUnitedMobileDriver_S497MA20_WHQL_ML_Ver_1.0 .exe "
5.Turn Off phone, Remove your phone's SIM and SD cards.
6.Press and hold voll up button in phone.
7.When u holding "voll up button" connect the USB cable.
8.When computer detects the new hardware (Omap4430) release "voll up button".
10.After Driver installation, go to device manager and change the port "LGE CDMA USB SERIAL PORT" to "com41".
b.As I wrote above, you must change the port for "LGE CDMA USB SERIAL PORT" not for "LGE Mobile USB serial port" as pictured.
12.In DLL select file for p920 or p920h ( from here http://forum.xda-developers.com/show....php?t=1246678
13.In S/W select only *.bin file from downloaded rom.
14. Choice (Check) "USB" and click OK.
15. Click on Port COM settings(COM plug icon)
16.Check as on photos.
17. Click start(The Port 1 window should appear READY).
18. Disconnects USB cable and wait 5 seconds.
19. Press and hold voll up button in phone and connect USB cable.
20. The update process will begin automatically after that release the "vol up".
21.When the progress bar reaches 100%, Power ON the phone.
If the update process has stopped for a longer time (about 5 minutes) not disconnect the phone from USB, , press and hold Vol Up + Power and wait when update process resume.
You do this on your own risk!
Jeśli widzicie błędy, piszcie.
UPDATE 18 SEPTEMBER 2011
To flashing rom with LGFLASHTOOL without errors you need right USB cable.
Between 4 and 5 pin you have to solder resistor 910 Kohm.
The update process is the same ,but u don't need press any button when connect USB cable to phone.
Phone screen during update
This fix update screen isue
After flashing the phone will restart.
Update screen appears again(don't disconnect usb cable from phone and don't close LGDLASHTOOL)
Please wait until you see the info about error of OTA update.
After that the phone rebots and power On automaticaly.
Thanx to Marti701