I am running into something very similar after upgrading to 2026.7.0 where I receive this error:
The version of Z-Wave Server you are currently running is too old for this version of Home Assistant. Please update the Z-Wave Server to the latest version to fix this issue.
When I look at my Z-Wave devices, I see this:
Failed setup, will retry: Invalid server version: Z-Wave JS Server version (3.8.0) is incompatible. Update the Z-Wave JS Server to a version that supports at least api schema 49
My HA server sits on a VM in a QNAP NAS and I run a separate instances of ZWave-JS/Zwave-JS-UI on a Raspberry PI 4B, along with Zigbee2MQTT.
I used NPM to install Z-wave and I see I am on these versions:
zwave-js-ui: 11.16.2
zwave-js: 15.23.5
I even ran this: sudo npm update -g zwave-js-ui
I got this:
khilzinger@kah-zwavezigbee001:~ $ sudo npm update -g zwave-js-ui
changed 1 package in 5s
103 packages are looking for funding
run npm fund for details
npm warn allow-scripts 2 packages have install scripts not yet covered by allowScripts:
npm warn allow-scripts @serialport/[email protected] (install: node-gyp-build)
npm warn allow-scripts [email protected] (postinstall: node -e "try{require('./_postinstall')}catch(e){}" || exit 0)
npm warn allow-scripts
npm warn allow-scripts Run npm install -g --allow-scripts=@serialport/bindings-cpp,es5-ext to allow these scripts once, or npm config set allow-scripts=@serialport/bindings-cpp,es5-ext --location=user to allow them for all global installs.
khilzinger@kah-zwavezigbee001:~ $
I am more than willing to upgrade my Z-Wave server if I could be shown how.
Failed setup, will retry: Invalid server version: Z-Wave JS Server version (3.8.0) is incompatible. Update the Z-Wave JS Server to a version that supports at least api schema 49