Hello,
Updating ILO firmware should only help if your read the ILO SNMP, you talked about the Windows SNMP. What type of server are you trying to monitor? If the server is a Gen8 or higher you should use the ILO and AMS for monitoring. If your server is older than that you can use WBEM or SNMP agents? Can you post screenshots of your SNMP settings blurring the actual settings? So things like who can read the SNMP, most systems only have localhost as an allow host. Add your SIM server to the allow list and identify your server to see if this is the problem.
