I have a DS-2CD2132-I purchased from Nelly’s currently on version V5.1.2 build 140116 / V5.0 build 140110.
With 5.1.2 I have no test buttons available so my question is which version should I or (would you) upgrade to? 5.1.6 or 5.2.0
Another question I think I already know the answer...