DVBSky S960 Firmware Not Installing - SYN Flooding SNMP Counters

I’m trying to install my DVBSky S960. I have downloaded the firmware suggested (I tried both the manufacturer’s recommended firmware for this model, and the one DMESG states it’s searching for), and pasted it into /lib/firmware folder.

Each time I reboot, I receive this message:
TCP: request_sock_TCP: Possible SYN flooding on port 9981. Sending cookies. Check SNMP counters.

I have tried increasing the backlog capacity, and even disabling it completely, however I still receive the same message as above.

Can anyone shed any light please? I’m unable to find muxes on TVHeadEnd - and I’m guessing it’s because of this firmware won’t install, but if anyone has any other ideas please let me know.