XCVario-20 upgrade to XCVario-57

The XCVario-57 edition version is an improved version of the 2020 variometer model with a second RJ45 connector at the rear for CAN bus, serial connections and a flap senor. It features also the AHRS (attitude) sensor already with temperature control (less drift), an improved 3W loudspeaker with better performance at lower frequencies and less distortions, and comes with a brighter display with 1200 nits (!) and anti glare plus anti fingerprint surface that is perfect readable, even there is a reflex on the display.