Nuki refuses to replace the product, this is obviously a software bug, not a hardware one.
I informed the seller (Tink) about that procedure and think it was my last nuki.
The original lock is already replaced, i used the Bridge with the Smartlock 3.0, which i bought 3 months ago at Amazon, luckily, i am able to return that crap.
nearly 3 Years of nuki seem to be enough.