Unfortunately, this point has already been reached with the Gigaset GS290… Update support end was August 2022. 
This already results in the first negative consequences, see here:
Another issue is Android 10:
Actually, the end of support should be reached shortly. Usually, security updates are only provided for 3 years after the Android version is launched.
How long can the Gigaset GS290 still be supported under these conditions?
Greetings
Frank