How to flash LG GC900 with new .fls firmware
All credits to pbalanq
PS: Flashing will erase all the data from the phone.
Tools Required for Flashing:
1. Download .fls Firmware(GC900AT-00-V10b-454-XXX-JUN-12-2009 +0. Fls)
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Loginhttp://www.zshare.net/download/6336689023870bcc/
2. Download FlashTool Program: You are not allowed to view links.
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LoginFlashTool_E2.zip
3. Download File. You are not allowed to view links.
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LoginIFWD_DownloadDll.dll
Procedure:
1. Extract FlashTool_E2.zip to C:\FLASHE2 folder
2. Copy IFWD_DownloadDll.dll to C:\FLASHE2 folder
3. Copy firmware.fls to the folder : C:\FLASHE2
4. Switch off your phone. Do not connect the USB cable.
5. Remove the memory card, SIM card and battery from the phone.
6. Start c: \ FLASHE2 \ FlashTool_E2.exe
7. In file menu choose "USB Map Wizard", then click "next" button.

8. Connect your phone to the computer using USB cable. When your mobile is detected click done.

9. Select "Infineon USB Driver" in communication area
10. Disconnect your phone from the PC.
11. Browse to the .fls firmware in your computer

12. Click on the yes button on the warning box.
13. Connect the phone to the PC and
quickly click on Start USB1

14. Flashing should be over in 15 minutes.

15. Disconnect the phone from the computer. Insert the SIM card, memory card and battery in the phone and start it.