Yeelight - Crystal pendant not connecting after firmware

After the last firmware update my Crystal Pendant light won’t work anymore. After the update it stayed offline - also after turning it off for a minute and on again, it didnt re-appear. So I did a reset and tried to reconnect it to my Yeelight app.
It everytime ends up at connection timed out and I followed every step mentioned in this forum. And when I want to retry I have to reset the whole thing again because otherwise it doesn’t appear in the search for device list.
It did connect when I tried it with a direct hotspot on my phone - so the lamp it self should be fine.
It looks like my router is blocking it? Anything else I can do?
Pinging seems to be working fine.

MI ID: 1608997722


I have the Same Problem. Are there any workarounds?