System, comprising: a mounting frame assembly for receiving a head unit in a vehicle, and the head unit insertable into the mounting frame assembly; wherein the mounting frame assembly is fixable to the vehicle and is configured to house one or more first connector assemblies including first electrical and/or optical connectors to be connected to complementary second electrical and/or optical connectors of the head unit; the mounting frame assembly comprises first fixing means for interacting with second fixing means of the head unit and for forcing the head unit into the mounting frame assembly and thereby connecting respective connectors; the first fixing means comprises a movable first structure configured to interact with a second structure of the second fixing means of the head unit to provide a pressing force of the head unit against the first connectors when the first structure is moved; and the first structure is rotatable around a joint of the mounting frame assembly and comprises a protrusion configured to be slidably received in a guiding region of the head unit, wherein the guiding region comprises a straight part and a curved part; characterized in that the first fixing means comprises a manually operable lever, the manually operable lever comprising the protrusion; and the mounting frame assembly and the head unit are configured, when the protrusion is engaging the guiding region along the straight part, to slidably receive the head unit in the mounting frame assembly up to an intermediate position and, when the protrusion has come out of engagement with the straight part to come into engagement with the curved part and to slide along the curved part, the head unit is forced into a final position while operating the lever in a first direction and thereby connecting the one or more first connector assemblies to respective second connectors of the head unit, and wherein the mounting frame assembly and the head unit are configured to force the head unit from its final position to the intermediate position while operating the lever in a second direction opposite to the first direction to drive the protrusion along the curved part back towards the straight part to thereby disconnect the one or more first connectors from the respective second connectors. a mounting frame assembly for receiving a head unit in a vehicle, and the head unit insertable into the mounting frame assembly; wherein the mounting frame assembly is fixable to the vehicle and is configured to house one or more first connector assemblies including first electrical and/or optical connectors to be connected to complementary second electrical and/or optical connectors of the head unit; the mounting frame assembly comprises first fixing means for interacting with second fixing means of the head unit and for forcing the head unit into the mounting frame assembly and thereby connecting respective connectors; the first fixing means comprises a movable first structure configured to interact with a second structure of the second fixing means of the head unit to provide a pressing force of the head unit against the first connectors when the first structure is moved; and the first structure is rotatable around a joint of the mounting frame assembly and comprises a protrusion configured to be slidably received in a guiding region of the head unit, wherein the guiding region comprises a straight part and a curved part; characterized in that the first fixing means comprises a manually operable lever, the manually operable lever comprising the protrusion; and the mounting frame assembly and the head unit are configured, when the protrusion is engaging the guiding region along the straight part, to slidably receive the head unit in the mounting frame assembly up to an intermediate position and, when the protrusion has come out of engagement with the straight part to come into engagement with the curved part and to slide along the curved part, the head unit is forced into a final position while operating the lever in a first direction and thereby connecting the one or more first connector assemblies to respective second connectors of the head unit, and wherein the mounting frame assembly and the head unit are configured to force the head unit from its final position to the intermediate position while operating the lever in a second direction opposite to the first direction to drive the protrusion along the curved part back towards the straight part to thereby disconnect the one or more first connectors from the respective second connectors.