What will we 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:
Lgutils(we are going to download CUST_THEME file and upload it again with it):
Download
KP500.flb(needed by Lgutils):
Download SWF loaders(we will use them to load our themes from the phone instead of CUST_THEME) 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 files that we are going to replace.In this tutorial I am going to use "SLIQ" idle_widget(your phones desktop) made by coma.Go ahead and download the files.
Download
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 extract the file idle_widget.dmf from the archive Loaders.rar 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\dmf . Select a file that we are going to replace(idle_widget.dmf) and delete it.
Now select image>inject from the top bar.
Navigate to directory where the file you want to replace is located(the idle_widget.dmf file that we saved 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.Don't be scared if it shows a black screen when it fully loads.It is because we replaced the original file with a loader,which does not contain any graphics itself.Now we are going to fix this ;). Make sure your phone is turned on(startup animation already passed) and plug in your phone to the USB cable.Select "mass storage" .Now open the SLIQ.rar archive and extract it's contents to phone memory\flashcontents : 
Disconnect your phone from the USB cable.That's it.You should now see that you have your new modified phone desktop. If you want to put different idle_widget's now, all you have to do is delete files in Flashcontents folder replace them with the ones you downloaded.
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