> Do I need to update the firmware?
If you are lucky; Sylvania is a branch of Funai which is the 'bottom of the barrel' on quality so it may be just another case of Funai-ism.
Other brands belonging to Funai:
Symphonic, Emerson, Aventura, Durabrand, ESA, Magnavox, INSIGNIA, Philips and Misakai
I earned part of my income from servicing consumer electronics some years ago and historically, Funai gear has been among the worst built.
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