Great, thank you very much, that helps.
There are two variants of the PCB. One is yours, which is ‘actually’ supposed to be the right one, and this variant: 49NXM5MD6DSKb
We do not support this ‘b’ variant. However, these are still two identical cards. I suspect that KFA only sells the ‘b’ variant and has not changed this on the stickers. We have already had this with other brands.
That's super annoying for customers and of course for us too. Because the brands don't share this information and then you're faced with a problem like this.
That's why we write in every manual that you should physically check the compatibility beforehand. I can only advise you to send the cooler back. And we will remove the compatibility.
Sorry for the trouble.