No Wifi/Bluetooth on Pi0W V1.1

Hello gadgetoid,
last Sunday (20/08/2017) i ordered a “Pirate Radio” Kit and a “Hammer Header Kit”. The items got delivered yesterday. Today i put everything together using the hammer headers, which worked fine. I followed the tutorials on this site, trying to set everything up on the software side. On the first boot i also noticed that there is no status led blinking. I also was not able to get wifi working. So i popped my sd card into my pi3 and wifi worked just fine, so i used it to update the whole system via:

sudo apt-get update
sudo apt-get upgrade

Back on my Pi0W, wifi was still not working.

dmesg | grep wlan

does not show any interface.

ifconfig -a

only shows the loopback lo.

After searching the web i found this thread and tested everything suggested on here:
My Pi0W also tells me to be an Pi Model B:

cat /sys/firmware/devicetree/base/model

gives me:

Raspberry Pi Model B Rev 2

Running sudo vcgencmd otp_dump also shows me this for line 30:

30:00000000

I’m afraid now that i also received one of those bad one-time-programmed units.

Do you have any suggestions i could try to get it working?

Thanks in advance.