Gigabyte Brix s - no network devices found


i am new to OpenWRT and I am not a Linux guy. I managed to install OpenWRT on a Gigabyte Brix s GB-BLCE-4105 based on this post:

Console say: OpenWRT 19.07.02 r10947-65030d81f3

After booting up OpenWRT i come to the console, and

shows up only lo Loopback

on vi /etc/config/network
eth0 shows up default settings

on cat /proc/net/dev
i see only lo

i try'd to check the bootup log with


and i didnt see any Lines matching to the Gigabit LAN (Realtek RTL8111HS) from the Brix s.

Same with cat /sys/kernel/debug/usb/devices

So i connected an i-tec USB to LAN device and cat .../usb/devices showed me:

P: Vendor=0bda ProdID=8153 Rev=30.00
S: Manufacturer=Realtec
S: Product=USB 10/100/1000 LAN
S: SerialNumber=000001

But still no eth0 or something.

Here i found the hint, that i need this package: kmod-usb-net-rtl8152

But where can i download them? And how do i install it? I never have done that before and using my google skills doesn't show me any solution i understand.

Thank you for your help.

(I didn't post the full log or return because i would need to type it manually. Or is there some other way to Copy it to an USB Stick?)