Dear Valer77, BIOS turned out to be not permanent. I just updated the BIOS in M-FLASH with the next beta 1H1 and Slic disappeared!
For the SLIC to be permanent, it would have to be stored outside of the actual firmware space (as you are overwriting (almost*) the complete firmware when you flash). There are some mods where the SLIC is stored in the DMI area and survives flashes, but that's not always possible. In short: You overwrite the whole firmware when flashing, so the SLIC must be in the new firmware or it is lost. Firmware = BIOS or UEFI *The Boot Block is only re-flashed when absolutely necessary.
Can you please post the shown message if an unauthorized wifi card is installed? Done, found the message string inside the dump. Do you have write access to the bios? It is absolutely mandatory, because it isn't possible (yet) to flash a generic pre-modified bios w/ factory tools. In most cases a SPI programmer will be needed and (de-)soldering skills to remove and install the SPI chip(s).