Hold the setup button down for 30 secs and see if a menu comes up. It should say the HW version
That will work if the hidden menu is enabled.
One thing to consider regarding the version of the RNS: if you scan an early one that's had a later Firmware installed, it may well scan as a 'C' unit...but may not be.
I have VCDS scanned a RNS that looked to be a 'C' unit, but the sticker on the case said it was an 'A' unit.
It looked to be a 'C', behaved like a 'C'...but would not take a Firmware update.
So be warned...check carefully.
It's 5 mins to remove the RNS and physically check the sticker...it may save you hours of head scratching...or worse!
