Trong nay la huong dan de up rom cho GM730
http://www.lg-phones.org/lg-gm730-wm6-5-firmware-download.html
How to install the firmware onto your LG GM730 Steps:
Originally Posted by "chartreux" on xda.developers.com
ok I managed to update my GM730 via KP500-Utils.
quite tricky but this is the closest upgrade process with standard LG update process. below is the steps:
1. run LGUserCSTool.exe –> start update and when there is a prompt [Close] [Next] choose [Close]. basically you just need to be in emergency mode screen.
2. unplug the usb and plug in back again.
3. run KP500-Utils-EN
4. choose I and extract the V20H_00.kdz to V20H_00.cab
5. choose J and type GM730 follow by cab name and firmware name (V20H_00)
6. the Phone Update software will start to extract V20H_00.cab file in this folder C:\Documents and Settings\All Users\Application Data\LGMOBILEAX\Phone
7. wait until finish as the normal process update from LG