Is it possible to add a virtual dimmer, switch your automations/etc to that device and then remove your Zen27? Include/update firmware/remove/include again and switch over device. Should work...
I thought about that but wondered if there was an easier way. I have other ZEN27 switches I don't mind redoing if needed, but one in particular has a number of things tied to it and the easier I can make this for myself the better. 
Unfortunately I don't think there's a solution for you outside of the convoluted steps @gmason and others have described. Someone correct me if I'm wrong, but Zooz switches always require a factory reset after a FW update, which means re-inclusion, which means it won't have the same device ID, which means all your automations will need attention.
None of my Zooz devices (switches/dimmers) were responsive after a firmware update and I have probably ten of every version (some non-upgradeable and relegated to garages etc). Some were downright difficult just to update too. So absolutely re-inclusion is required.
Absolutely correct. By design as I recall.
S
Thanks, all. FW updated and switch re-included (without security) without issue. Next order of business is to figure out how to set up the different "buttons" on this ZEN27 (e.g. double-tap up, four taps down, etc.). Hadn't yet bothered after moving from SmartThings to Hubitat, but now that this driver is actually working I need to learn more.
Note on the button controllers after a Zooz FW update when using this driver.
Delete the old button controller and start over from scratch.
Brian has mapped eight buttons with pushed functions only. I have three Zen27 and two of them map button 1 to the upper paddle and one maps it to the lower. It was my first Zen27 so maybe it’s an older version of HW. Dunno. But before you start doing button controllers, watch the logs and press a button so you know which way it’s mapped.
I have also have a couple of my zen26 that don’t follow the other dozen I have.
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See this post for anticipated button mapping
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Thanks! Buttons are now all working as expected. Greatly appreciated!
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Hi,
I've released an update to the Zen27 driver based on the updates I made to the Zen22 driver. It's completely untested (since I don't have any Zen27 devices yet) but the code looked exactly the same. Changes:
- Fixed certain parameters that should be able to be set to 0 but the driver didn't allow it
- Added support for 4-tap and 5-tap
- Added support for held and released
The driver can be found here:
FWIW, I am having the same issue mentioned by several individuals above. I recently purchased about 20 ZEN27 dimmers, and started installing/adding them to my hub (Hubitat C7; Platform 2.2.4.148). All devices were installed S2, and worked great with stock Hubitat drivers. I've now attempted to update all of the switches to the custom driver for additional functionality, and all the switches immediately stopped responding. This issue does not exist on switches of other brands (ie: I can run the advanced/custom drivers for Inovelli Red through S2 security) so must be a driver issue.
@agnes.zooz - Can we expect an updated custom driver that supports S2 connectivity? The idea of reverting zwave connectivity to an outdated/less secure protocol in order to more fully utilize the features of this switch, is not that appealing.
I suppose I will revert to the stock Hubitat integrated driver in the meantime.
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These are a community drivers as far as know, they were not provided by Zooz. I dont think they create or post drivers while inovelli does. So not much to do but wait for someone to own this drivers and work on them or you may give it a try.
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That's interesting, as they list the advanced driver here on their website: www**[dot]support[dot]getzooz[dot]**com/kb/article/440-how-to-access-advanced-settings-for-zen27-dimmer-switch-on-hubitat/ (sorry... I had to remove the dots from the hyperlink as I am too new to the forum)
So, I assumed that they were officially supported by Zooz?!
No, not officially supported by Zooz. They just point us here as a courtesy, more or less. 
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I believe it was authored by bcopeland before he joined Hubitat Staff. So we'll see if the "community" driver gets fixed OR the native driver gets updated to out date the community driver.
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I made a change to my fork of the driver that you can try if you want, and let me know if it works.
(Disclaimer: I don't know much about writing a Z-wave driver.)
Driver is here:
https://raw.githubusercontent.com/dds82/hubitat/master/Drivers/zooz/zen27-dimmer.groovy
Many thanks, I'll give it a try.
One comment though, unless I missed it I didn't see any note on your modification. You should at least add a date and your name, screen name or initials with a statement that you changed "...........". Not in detail but maybe something like " change the way the _____ worked.
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Thanks @dsegall I'll probably take a look at your driver in the near future... but after the hiccup today, I'm going to finish installing all of my new switches and devices first, make sure the system and z-wave network are stable... and THEN I'll start trying to access the advanced features! I'll post back once I get a chance to try it.
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We're not planning to release a separate custom driver for this model in the near future but @bcopeland mentioned this driver should receive an update soon 
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I can confirm your updated driver seems to work with S2. The output from "configure" seems to be much different than the default driver so not sure if everything is working but going to give it a try. I will probably be forking your repo to make changes if I find anything.
