Filament Bulb loses WiFi connection

The light bulbs have been losing the WiFi connection for a long time. This is due to the firmware.

A few months ago my firmware was upgraded to an older version by a nice Yeelight employee. Since then everything has been working very well. Unfortunately, one of my lightbulbs broke and I received a replacement from support. Here again a faulty firmware is unfortunately installed.

Can someone please install the firmware “2.1.7_0018” for me? Everything works perfectly with this one.

Thank you very much!

Really nobody can help here?