Upgrading Firm Ware to support Catalina
I currently have a 27" late 2009 iMac. I'm running a 2.8 GHZ processor, 8 GB memory,, 1067 MHZ DDR3, SSD w/406 GB Storage available. I would like to upgrade to Catalina from Sierra but I keep getting an "error" that says it cannot be upgraded. I realized that my iMac is later than the 2012 that is supported but is there a way to upgrade the firm ware to support the OS upgrade or is there more to it than that?