Does anyone know if Beolab 3500 was ever shipped with software versions higher than 3.1 or if the higher versions was only available as upgrades? The reason for asking is that a local seller has a Beolab 3500 MK2 with a much higher serial number than mine, so it could be interesting if it had the higher software version. The SW version is not printed on the label, and the seller does not have a remote to check it