Bosch started rolling out Smart Home Controller firmware on July 14, 2026, that fixes three failure paths for the Smart Home Controller II Matter Bridge. Bosch says the bridge could lose its connection after the controller restarted or updated. The release also addresses an Apple Home problem caused by certain characters in a device name and improves bridge stability during a cold start.
Controller versions 10.35.5820-5158 and 10.35.5820-5159 began rolling out on July 14, with availability to all customers expected on July 15. Bosch does not say how common the failures were, which device-name characters triggered the Apple Home issue, or whether every affected installation will recover without further action. This is a targeted reliability fix, not evidence that the bridge had failed in every Bosch home.
The update matters most in a Bosch-centered setup that shares several devices into another Matter ecosystem. Bosch lists motion sensors, dimmers, radiator and room thermostats, relays, door and window contacts, and smart plugs among the device types its Controller II can bridge. If that single bridge connection disappears, several shared controls can vanish from the receiving app together. Treat that pattern as a controller or bridge problem before assuming that several accessories failed independently.
Directly paired [+M] devices are a different path. A Bosch Radiator Thermostat II [+M], Motion Detector II [+M], Door/Window Contact II [+M], or Smart Plug Compact [+M] paired straight into a Matter system does not depend on the Controller II bridge. The bridge fix applies when devices live in Bosch Smart Home and the controller shares their Matter-defined functions outward.
Bosch's support guidance says the app notifies owners about controller updates and lets them install immediately or later. After the update completes, check one noncritical bridged device in the receiving app before changing automations or re-pairing accessories. Apple Home users who previously had trouble with a named device should check that device first. Matterhome has not tested the rollout, so avoid a factory reset based only on an absent control. Confirm the controller update, let the bridge reconnect, and use Bosch support if the shared devices still do not return.
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