Shelly firmware not updating

Hello,

I have several shelly's installed in my house, type 1 and 2.5. Most of these are stuck at firmware 1.5.9 and report that this is the latest version. I have tried to update the firmware to the newest version with the ota update link found on this support site but no success.

Here is the url used and respons for the shelly1:

http://{my shelly1 ip}/ota?url=http://archive.smarthome-forum.eu/v1.8.3/SHSW-1_build.zip

{"status":"updating","has_update":false,"new_version":"","old_version":"20200122-090220/v1.5.9@4b657c90"}

Here is the url used and respons for the shelly2.5:

http://{my shelly2.5 ip}/ota?url=http://archive.smarthome-forum.eu/v1.8.3/SHSW-25_build.zip

{"status":"updating","has_update":false,"new_version":"","old_version":"20200122-090247/v1.5.9@4b657c90"}

How can I get these shelly's to the most recent firmware without physically removing them and manually updating the with a ftdi cable?

Zitat

Try to make an OTA update.

That is exactly what I have tried but it is not working.

Sadly I have already tried every version that is listed. Could it be that I need to open some ports on my fritzbox to allow the update to run?