Download a custom launcher app from the Play Store that allows you to customise your app icons. We will use Nova Launcher in this example.
Open Nova Launcher and set it as your default home app.
On your home screen long-press on the the app you want to customise. Then press the pen icon in the top right corner.
Tap the app icon.
Select Gallery apps.
Select the app where you stored your SLM 880 icons (we use Dropbox in this example).
Navigate to where you stored the icons and select your theme.
Select the icon from the list.
Press Done in the top right corner.
Tap Done and a new icon will now be on your Home Screen.