How to check for new firmware

[Thkos123]

I have installed Zigbee2Mqtt and the frontend on a Pi. Frontend works fine, but I am struggling with the firmware updates.
I have added 1 device : a blitzwulf switch (Yuya).
The OTA pages shows nothing, no device no current version, or new version.
I have read https://www.zigbee2mqtt.io/guide/usage/ota_updates.html

It should be able to manually check from the command line by sending a message. zigbee2mqtt/bridge/request/device/ota_update/check
My attempts failed I have no clue how to do that .

Any advice on how to check the firmware through the frontend or using the command line are welcome.
Thanks Theo

[Koenkk]

If the device doesn't show up under the OTA tab, OTA updates are not supported for this device.