I can't get the RTL8125 to work

Hello,
I wanted to install a new TrueNAS Core system today.
To do this, I downloaded the latest TrueNAS image to a stick and installed it on a new PC.
Unfortunately, the new PC uses a 2.5 Gigabit from Realtek, namely the RTL8125.
And unfortunately TrueNAS does not find a network card after starting and I therefore have no access.
I have been googling for 3 hours now and have tried everything with no success.
But the card is displayed with ‘pciconf -lv’.
Of course I have already gone into the shell and edited the file ‘/boot/loader.conf’ and added the following lines:

if_re_load="YES"
if_re_name="/boot/modules/if_re.ko"

But that didn’t help, after a reboot the lines were still in the file, but the network card was not recognised.
Then I had a look and saw that there is no ‘if_re.ko’ at all in the /boot/modules folder.
Installing via PKG does not work without Internet and Internet only with network.
So I searched and found the file ‘realtek-re-kmod-196.04.txz’.
This is the last one for FreeBSD12.
I then extracted ‘ir_re.ko’ from the archive and copied it to /boot/modules.
But that doesn’t work either.

Welcome to the community!

Those 2.5Gbe cards aren’t well supported on CORE generally. They tend to work “well enough” on SCALE, your best bet would be to start there IMHO.

This is the tunable I have for a few years. Never had an issue :
Variable : if_re_name
Value: /boot/modules/if_re.ko
Type: Loader