Nvidia Shield homescreen now has adverts !

Follow the process below to install a custom launcher
(APK at the bottom of the page)
Steps to confirm your Device IP address and confirm ADB is enabled:
- Go to settings — Device preferences — About

2. Inside the About page, scroll down to Build and press select 7 times

3. Press the back button and scroll down to “Developer options”

Find Network Debugging in the list and turn it on:

Install the APKs below and then open up the Launcher Manager

Click on Enable Custom Launcher

You will now see this:

This confirms that your stock launcher is disabled and pressing the home key will allow you to select a new launcher:
Press the home key and you will see

Select Wolf (or any custom launcher) and choose Always if you always want your device to use this custom launcher when you press the home key.
If you want to restore the stock launcher, open up the Launcher manager again
Click on disable custom launcher

Software Needed
Choose a Launcher Manager depending on your device (Ensure you choose the correct one)
Launcher Manager Android TV 1.03
Launcher Manager Chromecast Google TV
Install the a Custom Launcher (Make sure you have this already on your device before disabling stock launcher !!
Leanback On Fire (All credit to Tsynik)
Widgets Enabled by default !
This will give a result like:
