The Leap S3 box is designed to transmit 4K streaming platform content. You must have the corresponding subscription and the connected TV must be 4k compatible and the transmission parameters must be set to the highest 4K/2160P resolution.
The box’s default resolution is 1080P. This is because most TV models support it.
If a 4K-compatible TV is connected to the Leap S3, there will be automatic communication via HDMI between the box and the TV to determine the maximum possible resolution.
If you find that this communication via HDMI with certain TVs doesn’t work as it should, the cause may be the HDMI protocol (CEC) or an entry-level HDMI cable, which is very often the case. Resolution is then maintained at 1080P. In this case you need to go to the « Display » menu and manually select the highest resolution 4k / 2160P.