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Have a look through the menu for “Support”, it may be listed in there.
Failing that, your receipt, or, if bought online have a search through your inbox for the purchase confirmation.
Check the menu under "Contact Samsung" This should display the model number and software version plus, possibly, the serial number. This shows on my smaller, and cheaper Samsung TV of a similar vintage.
There's no Contact Samsung option on my set. Whereabouts on your menu is the contact Samsung option? I think it's an old, first Gen UHD model. Will a modern budget set have a much better picture?