Most of the tutorials here include downloading and uploading your CUST_THEME file to/from your phone. So I decided to make separate lesson that explains how to do it. What will we need: -Patience -USB cable -Download a few files -Phone itself ;) Before we start,download all these files: Lgutils(we are going to download CUST_THEME file and upload it again with it): Download KP500.flb(used by Lgutils): Download Infineon USB driver(we will need this for lgutils to find our cookie): Download Winimage(I will explain why we need it later): Download So,now that all the files are done downloading,let's start. Extract Lgutils to "desktop" folder. 
Extract KP500.flb to "C:\" directory(it will be easier later if you extract it there): 
Install Infineon USB driver.
Install Winimage.
Now we are going to download and backup original CUST_THEME file. IMPORTANT: before you connect your phone to PC take out battery,SIM and memory-card. IMPORTANT: make sure you have at least 2 GB free space in the hard drive where you saved Lgutils before going to next steps. Open Lgutils (KP500-Utils-EN.exe) which we extracted earlier. Type in "D" and press [enter]: 
Type in "\\.\USB1" and press [enter]: 
Type in "C:\KP500.flb" (or other location where you stored the file) and press [enter]: 
IMPORTANT: before you connect your phone to PC take out battery,SIM and memory-card. Type in "CUST_THEME" , press [enter] and quickly connect your phone to the USB cable: 
If you done everything correctly, you should see following message: 
Following process will take 10-25 minutes depending on your system so wait patiently. IMPORTANT: Do not close the program or disconnect your phone while this process is in progress, or you may damage your phone! After you see this message,it is safe to unplug your phone and close Lgutils: 
Now you should have 2 files in the Lgutils directory, CUST_THEME.big and CUST_THEME without extension: 
Delete CUST_THEME.big file because we will not need it. MAKE A BACKUP OF THE CUST_THEME FILE TO ANOTHER DIRECTORY IN CASE ANYTHING GOES WRONG. Now I will eplain why did we need to download and install winimage. Think of it as a special archive manager(e.g. like winrar) that we need to open and edit the CUST_THEME file. Open Winimage. Select File>Open and navigate to the Lgutils directory.Select CUST_THEME file and open it: 
If you get a pop-up that asks you to select a "partition to connect to" just press ok. Now you can make changes that explained in other tutorials in this website.We don't need to change anything so just close the program(winimage) now. Uploading CUST_THEME back to our phone. Open Lgutils again,push C and press [enter]: 
Type in "\\.\USB1" and press [enter] . Type in "C:\KP500.flb" (or other location where you stored the file) and press [enter] . IMPORTANT: before you connect your phone to PC take out battery,SIM and memory-card.
Type in "CUST_THEME" , press [enter] and quickly connect your phone to the USB cable.
If you done everything correctly you should see following:
Following process will take 10-25 minutes depending on your system so wait patiently.
When you will see the following,it is safe to plug your phone from USB cable and close Lgutils:
That's it! I think I covered pretty much everything that is needed to download the CUST_THEME file from our phone for editing and uploading it back to the phone. If you have any problems, leave a comment here.
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