If you are trying to reset smart hub on your samsung tv and when you go to settings -> All Settings -> Support -> Self Diagnosis and here when you are trying to select Reset Smart Hub option on samsung tv and it is grayed out or smart hub reset option is not available then you cant reset smart hub and you need to get back reset smart hub button enable to reset smart hub.
Why Samsung tv Smart Hub Reset Greyed Out or Not Available
If you have any other application running or you have kept it open on your samsung tv and then if you go to reset smart hub on samsung tv then reset smart hub option will be grayed out and you need to close all opened application or apps running in background and then reset smart hub option will be enabled.
Fix Samsung TV Smart Hub Reset Not Available
Below are simple solutions to easily fix and get back the reset smart hub option back and reset your samsung tv successfully and erase all apps and restore factory default settings.
Turn off and Turn on Samsung tv
Grab your samsung tv remote and press the power button and simply turn off samsung tv and wait for 30 seconds and then turn on samsung tv and reset smart hub option will be enabled.
You can also remove the power cable or press the power button on samsung tv panel and restart your samsung tv and then reset samsung hub by going to reset smart hub settings.
Close Open Applications Running in Background
When Reset smart hub button option is not enabled then there is an application (app) running on your samsung tv and you cant reset smart hub when application is running in background and you need to close it and just check applications in background and close application and then go to reset smart hub option and reset smart hub.
Power Reset Samsung tv
Step 1: Turn on your samsung tv and then unplug samsung tv main power cable from the wall socket completely.
Step 2: Now, wait for 60 seconds and then plug samsung tv power cable back to the wall socket and then turn on samsung tv using the power button and wait for samsung tv to completely reboot.
Step 3: Now, go to settings -> All settings -> Support -> Self Diagnosis and Select Reset Smart hub option and enter pin and reset smart hub.
When you reboot or power reset or soft reset your Samsung tv, then it will close all applications (opened application) running in background and this will enable reset smart hub option and you will be able to reset smart hub now..