TV screen shows 'SKYWORTH' when turned on

Question

TV screen shows 'SKYWORTH' when turned on. Activated this by mistake and can not get back to previous mode. This caused channel reception to be bad and all channels are either not showing well or showing black and white.There is an option to switch to a simple game mode and it was probably done by mistake.Television Model is Hyundai HU-D25A but I understand same issue with other similar brands or brands manufactured by same manufacturers and just using different brand name each time.