IKEA recently introduced the TIMMERFLOTTE temperature and humidity sensor. An over-the-air (OTA) firmware update is now available. The update from firmware version 1.0.18 to version 1.0.21 can be performed directly via Home Assistant.
💡Chrissmart is giving away a TIMMERFLOTTE among everyone who, by 31.01.2026 leaves a comment on the linked article and briefly explains why they are interested in the sensor. Good luck!
Update notification directly in Home Assistant
After integrating IKEA TIMMERFLOTTE into Home Assistant, a notification about an available new firmware version appeared in the device section. Our sensor initially had version 1.0.18 installed. Home Assistant then offered the OTA update to version 1.0.21. The update was completed entirely within the Home Assistant interface.
How the OTA update from version 1.0.18 to 1.0.21 went




The update process was as follows:
- Select the TIMMERFLOTTE sensor in the device overview
- Display the available update from version 1.0.18 to 1.0.21
- Start the OTA update via the Home Assistant interface
- Automatic transfer and installation of the firmware
During the update, the sensor was briefly unavailable. Once complete, the device automatically reconnected to Home Assistant. The update finished without interruption or error messages and took only a few minutes.
After updating to firmware version 1.0.21, Home Assistant continued to display all the familiar information. The setup used a Raspberry Pi together with the Aqara Smart Hub M200, which served as a Thread border router.

Raspberry Pi 5 8GB Starter Kit
128GB edition | Official 27W power supply | Official case with fan | 4K Micro HDMI cable (1m) | Aluminum heatsink

Aqara Smart Hub M200
Matter controller, Thread border router with Aqara Zigbee, Bluetooth, Wi-Fi, PoE and IR; supports Amazon Alexa, Apple HomeKit, Home Assistant, SmartThings and Google Home
Note on changes introduced by the update
At present, no detailed information is available about changes or improvements in firmware version 1.0.21. We did not observe any visible functional changes during our test either. We will update this article as soon as further information becomes available.
Conclusion
The OTA firmware update for IKEA TIMMERFLOTTE from version 1.0.18 to 1.0.21 can be installed easily through Home Assistant and demonstrates the advantage of the Matter standard.
💬 Which IKEA smart home products do you currently use? Feel free to share your experiences in the comments.
Source/Photo: (Amazon / IKEA / image generator)

TIMMERFLOTTE Temperature/humidity sensor, smart




Ich bin Christian und habe den Blog 2024 gegründet. Ich bin gelernter Kommunikationselektroniker, technikbegeistert und Smart-Home-Enthusiast mit langjähriger Erfahrung im Bereich vernetzter Haushaltsgeräte. Mit großer Leidenschaft verfolge ich aktuelle Entwicklungen und teste regelmäßig neue Produkte, um verständliche Einblicke und praxisnahe Empfehlungen zu geben.