Press 'Open firmware':


Select your firmware:


Go to Hjukebox.grs and select it:


Press Edit:


Wait and press Extract as .XML:


Select a folder to extract all the images to:


Confirmation:


Now replace the images in the folder you've extracted them with custom ones.
There are no limitations on them (e.g. file size, image sizes, ...), although you have to keep in mind to stay close to the original image dimensions;
otherwise the result won't be very pretty...
Oh, and they have to be PNG images *only*.
P.S.: there will be a source.xml file in the folder, don't delete it. It is needed for the assembling of the firmware (you can view it if you want to).

Now go back to CreativeWizard and close this window:


Press Convert XML To GRS:


Go to the folder where your images are and select source.xml:


Choose a name to save the .GRS file as:


Press Convert GRS To Firmware:


Select the .GRS file:


Choose a filename for the firmware:


Choose your player:


Press Upload Firmware:


Connect your player to your computer and it should appear, then select it and press Upload Firmware:


Select the firmware you've made:

Now if everything went OK, your player will reset and you'll enjoy your new theme!

CreativeWizard and this tutorial is made by Maurus Cuelenaere.