I have many First Alert Z wave smoke and combo smoke and carbon detectors. All are starting to age out. I recently purchased a new model and it will not join Smartthings. You can tell the new models as they do not have an accessible battery. Older models require two AA batteries. I contacted First Alert and no help, finally contacted Smartthings and they informed me that it was not yet set to work. The new units are Zwave and asking if anyone knows the status and if there is a program to certify the new models to work. Thanks as always.
Try the driver listed in the attached link.
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