Gents
Can I use a #990 Remote at Version 1.6 and a Base at Version 1.52 without any ill effects?
Thanks
Dave
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And we want to do this because? You can certainly try it and see if it does what you want it to do. If it doesn't work reprogram the units back.
One would do this when going to a club or friend's house that hasn't updated yet. You should be ok. Lionel always recommends the base and cab2 be on the correct revisions but for the most part 1.52 and 1.6 wasn't all that different. I believe the major differences were Legacy sound diner car compatibility, sensor car features, and some minor bug fixes.
you will be fine
Thanks Gents
Marty has my situation explained..........at a friend's home who has not updated yet.
The question came up and no one knew the answer!
So........as I always say.........when in doubt...........visit OGR ! 
Dave
Take your black module over there n upgrade him. 
Been doing it for months. No issue.
While it's possible that you'd experience an anomaly, I've seen mismatched remotes at the club all the time, no ill effects that I've seen. Obviously, if someone shows up with some late Legacy locomotive like the VL-GG1 or the F40PH Cabbage that uses the AUX3 key, that won't work with an earlier remote and/or base software version.
