Z-Wave JS UI repairs startup for installations whose automatically generated HTTPS certificate is too old for the newer runtime. A stored 1024-bit key could cause repeated crashes after upgrading to 11.25.0. Rejected built-in certificates are now backed up and replaced with a new 2048-bit pair.
Custom certificates follow a stricter path: invalid or missing files stop startup with an explanation instead of silently substituting a self-signed certificate. Installations relying on that fallback must fix their custom certificate settings or remove both custom file settings.