Q: Logitech ultrathin not recognised Ipad air 2

hello to all of you,

I bought a Ipad Air 2 in combination with a logitech Ultrathin keyboard (cover) and everything worked wonderfull, UNTIL I updated my Ipad to the latest IOS version and my keyboard was not working anymore. So as you can find everywhere on the web, I disconnected via the bluetooth menu in the Ipad my keyboard, so far so good, but now the Ipad is unable to trace back the keyboard again..... Is there somebody facing the same issues as myself, and more, does she/he found the appropriate solution ??

thanks in advance,

Mario