What we will need: -Download a few files
-USB cable
-Read how to download and upload CUST_THEME file here.
Before we start make sure you have all of these files:
Font that you want change(you can find a wide selection here) Lgutils(we are going to download CUST_THEME file and upload it again with it): Download KP500.flb(needed by Lgutils): Download Infineon USB driver(we will need this for lgutils to find our cookie): Download Winimage(we will be editing CUST_THEME file with it): Download
So,now that all the files are done downloading,let's start.
We need a font we are going to replace. Choose carefully because it takes some time to change the font back if you won't like it, so I suggest taking your time picking and testing if the font will look good and is readable at small size.(in windows you can do that by copying the font to X:\Windows\Fonts\ directory and typing some stuff with the new font in your favorite word-processor). In this tutorial I will be using "Visitor" font. Preview:  Download Now we are going to download and backup original CUST_THEME file.This is just a quick overview and I suggest to read full tutorial here if it's the first time you are modifying anything(if you have a backup already you don't need to do this)
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 extract the file visitor1.ttf from the archive visitor.zip to Desktop.
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. Navigate to following directory: lgapp\Media\Font . Select the file that we are going to replace (LG_GothicSB_S_V[version number here].ttf) and copy it's filename by right-clicking on it and selecting properties,then copy the text from filename box. Now rename the font you have extracted on Desktop to this filename. For example my font in CUST_THEME was named "LG_GothicSB_S_V1.02_1121.ttf" so I renamed my font on Desktop from "visitor1.ttf" to "LG_GothicSB_S_V1.02_1121.ttf". Now go ahead and delete the file LG_GothicSB_S_V[version number here].ttf from your CUST_THEME in Winimage.Now select image>inject from the top bar. Navigate to directory where the file you want to replace is located(the LG_GothicSB_S_V[version number here].dmf file that we saved and renamed in desktop) and click open.After you done editing your CUST_THEME file,save it (file>save) and close Winimage. Open Lgutils again, type in C and [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: 
Now put your SIM card, Memory card and battery back into the phone and switch it on. The font should be replaced now.
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