182_blue - looks like your the resident expert here...
How do I check the current firmware version on my RNS 510 unit? And, what changes are there with this newer 1100 version?
well, depending what version your running you can check by opening the car, getting in, don't put key in ignition, start up the nav unit using the knob on the unit, then when VW splash screen starts up press and hold the set up button for about 15 secs, then you enter a hidden menu, here you will find your map version and HW number.
certain versions wont allow this until programmed to be allowed to do so via Vag com (bear in mind updating to 1100 will necessitate the use of vag com (one time only though) to enter this hidden menu)
As i said doing this update could Brick your unit, so do so at your own risk
heres mine now