Unable to add F5 appliances!

So I followed a Solarwinds video on adding F5s and icontrol and all that jazz. Now the video says that using Read-Only SNMP creds is sufficient. However... After I go through the Add Node wizard I get an error message that the device doesn't respond to the Read/Write community string. Which, ok... there isn't a R/W community string because you said a Read-Only was sufficient!! I've been trying for 2 weeks to get these F5s into monitoring and I'm ready to dropkick everything right out the damn window!!! 

Anybody have the same issues?? Any guidance would be GREATLY appreciated!!!!