Do you have a question about the Insignia NS-42E570A11 and is the answer not in the manual?
Locate and document your TV's model number and manufacture date from the label on the back of the unit.
Insert a USB flash drive into your computer's USB port to prepare it for firmware download.
Navigate to the product support page and download the firmware version corresponding to your TV's manufacture date.
Ensure TV is plugged in and off, then insert the USB drive containing the firmware into the TV's USB port.
Turn on the TV. A firmware upgrade prompt should appear; confirm to start the update.
Allow the update to complete, remove USB, power cycle the TV, and reprogram settings if necessary.