You can choose to reset only your TV picture and audio settings to their original values, or perform a full factory reset to return your TV to the state it was in when you first unpacked and turned it on.
To reset only your TV picture and audio settings to their original values, navigate to Settings > System > Advanced system settings> Factory reset, and then highlight Reset TV audio/video settings. Read the information on the screen to make sure you understand what the reset operation does.
To proceed with the reset operation, press PLAY/PAUSE three times in a row.
A full factory reset returns your TV to its original, out-of-the-box state. When finished, you must repeat Guided Setup, reconnecting to the Internet, re-linking your Roku account, and reloading any streaming channels. You also must repeat Antenna TV setup and input configuration.
Factory reset is the recommended choice if you want to transfer your TV to another owner, and is the only choice if you want to switch from store mode to home mode (if you inadvertently selected store mode during Guided Setup).
To perform a factory reset, navigate to Settings > System > Advanced system settings> Factory reset, and then highlight Factory reset everything. Read the information on the screen to make sure you understand what this reset operation does.
To proceed with the full factory reset, use the on-screen number pad to enter the code displayed on the screen, and then select OK to proceed.
When the factory reset operation completes, your TV restarts and displays the first Guided Setup screen.
It is possible that your TV might get into a state where you cannot access the various menus, including the menu option that lets you perform a factory reset operation. If that happens, you can force your TV to reset by following these steps:
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Insignia 40"/48" 1080p, 60Hz, LED Roku TV | NS-40DR420NA16/NS-48DR420NA16