IKEA recently TIMMERFLOTTE A temperature and humidity sensor has been introduced. An over-the-air (OTA) firmware update is currently available. The update from firmware version 1.0.18 to version 1.0.21 can be performed directly via Home Assistant.
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Update notification directly in Home Assistant
After integrating the 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 an over-the-air (OTA) update to version 1.0.21. The update was subsequently completed entirely within the Home Assistant interface.
This is how the OTA update from version 1.0.18 to 1.0.21 went.




The update process proceeded as follows:
- Selecting the TIMMERFLOTTE sensor in the device overview
- Displaying the available update from version 1.0.18 to 1.0.21
- Starting the OTA update via the Home Assistant interface
- Automatic firmware transfer and installation
The sensor was briefly unreachable during the update. Once complete, the device automatically reconnected to Home Assistant. The update completed 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 in combination with the Aqara Smart Hub M200, which acted as a Thread boundary 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 boundary router with Aqara Zigbee, Bluetooth, WLAN, PoE, IR, supports Amazon Alexa, Apple HomeKit, Home Assistant, SmartThings, Google Home
Note regarding changes due to the update
At present, no detailed information is available regarding content changes or improvements in firmware version 1.0.21. No visible functional changes were observed during our testing either. We will update this article as soon as further information becomes available.
Conclusion
The OTA firmware update of the IKEA TIMMERFLOTTE from version 1.0.18 to 1.0.21 can be easily installed via Home Assistant and demonstrates the advantage of the Matter standard.
💬 Are you already using Home Assistant or planning to start?
We welcome your experiences, tips and application examples in the comments.
Source/Photo: (Amazon / IKEA / Image generator)

TIMMERFLOTTE Temperature/humidity sensor, smart

My name is Christian, and I founded this blog in 2024. I'm a trained communications electronics technician, a tech enthusiast, and a smart home aficionado with many years of experience in the field of networked household appliances. I passionately follow current developments and regularly test new products to provide clear insights and practical recommendations.
The section "Update notification directly in Home Assistant" is duplicated. Overall, I often felt the information was repeated while reading. I think you could significantly shorten the article. 😉
Hi Hoppel, thanks for your tip. Greetings, Chris