In some cases, after applying the april 2017 marshmallow update, some users lose access to their tv home screen - pressing the home button brings up a grey screen, so access to the home screen and android menus from there is lost. Luckily there is an easy fix.

Steps:

1. Press the "help" button on the remote

2, select the "troubleshooting" option (first box) on the help screen

3. Select "settings" from the list of options on the left side of the screen

4. Select "configuring the tv"

5. Select "[tv]"

6. Select "jump to the settings screen"

7. Scroll to the right and select "apps"

8. Scroll down to the "system apps" row

9. Find "system software update" in the app list (it's alphabetical)

10. Select the "system software update" app

11. Choose the option to "clear data" and confirm

that will do it. Once you clear data on the system software update app the tv realizes the update is complete and access to the home screen, android menus, etc., is restored.