Make sure when buying a RNS 510 it's version C and above as they come with the LED screen & faster firmware 2760 they have a (Star Button) on the front top right corner!
The older version don't come with star button which are normally version A,B which are much slower and do not have the LED screen.
Most of the RNS 510 units coming up on eBay are from outside the United Kingdom, will be mostly version A,B which have been upgraded to version C firmware using hacked software, which at a later date can't be updated to the latest firmware and may brick your unit!
Also look out for counterfeit version C stickers, as the original VW one's have clear print and are perfect which located on the top of each unit!
hope this information help you find a good unit, instead of a lemon
