Yesterday i updated from 2.2.3.148 to the latest firmware. I am now unable read status of or controlling any of my z-wave devices.
What do I do now?
I didn't update before because I was afraid that something like this would happen. 
Is it safe to roll back to my previous version? Everything was stable and working without any efforts in that version.
Of course
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So, I rolled back to 2.2.3.148. But I am still unable to control my z-wave devices...
Well, It seems it wasn't safe at all to roll back! When I open the z-wave details page everything is gone! WTF!! 
Went back to the latest release and my z-wave details is back. But I am still unable to control anything.
Make sure you’re on latest. I would shut off hub (via shutdown), power down (unplug power) for 60 seconds or so. Then power back up and see if that gets things going.
Last update had a fix for upgrading from that far back.
Did you say what model hub?
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I powered the hub down and waited a couple of minutes. Now it works! Thank you!
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A normal "reboot" doesn't cause the Z-Wave part to actually get cleaned up. That's why you occasionally need to do a shutdown/power-off/wait/power-on. That causes the Z-Wave part of the Hub to clear its mind. 
(In case you were wondering)
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Welcome!
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That's also why I forget all my chores after a nap. Very convenient.
@tsaaek - I assume you're doing this, but just in case and for anyone else watching, always download a quick backup via the conventient backup button on the FW update screen, before you update your hub.
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