In reading the Zooz advanced settings for the Zooz Z27 switch (
https://www.support.getzooz.com/kb/arti ... -settings/), value 0 should be supported for parameter 9.
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Ramp Rate Control
Parameter 9: Adjust the physical ramp rate for your dimmer (fade-in / fade-out effect for on / off operation). Values correspond to the number of seconds it take for the dimmer to reach full brightness or turn off when operated manually. This setting is for physical taps only, see parameter 17 to adjust Z-Wave ramp rate.
Values: 1 – 99 (seconds). 0 – instant on/off. Default: 1.
Size: 1 byte dec
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If I was in your shoes (where the documentation says value 0 is supported for parameter 9), I would OTA the version 3.01 firmware released 2 months ago (which will revert the switch to factory defaults so you'll need to re-include the switch) - see:
https://www.support.getzooz.com/kb/arti ... hange-log/
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VER. 3.01 (released 10/2020 as OTA)
Firmware: 3.01
Changed power outage behavior in smart bulb mode
Applied timers to status reports in smart bulb mode
Changed the setting for Z-Wave ramp rate to automatically match the physical ramp rate (Parameter 17 set to default value 0)
Applied the ramp rate settings to Z-Wave triggered brightness transitions (multilevel changes)
Improved single-tap and long-tap timing for scene control triggers
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If you're still having a problem with parameter 9 and value 0, just contact Zooz support since I don't think there's anything else you can do to fix the problem.