Firmware Update and hardware test problems
I've just upgraded my RAM on my early 2011 Macbook Pro, and I went to test it was working ok by using hardware test only to find I'm not able to access it at all. I do't have boot discs and I've tried using restart-D which does nothing, so I tried Restart alt-D to use the online hardware test. It sort of works but I get connected to a grey screen with a spinning earth and a message telling me its trying to connect that just stays there forever. Some googling tells me that this may be because my firmware is not up to date. I've checked and found that this is indeed true (I'm running Boot Rom Version MBP81.0047.B27 SMC Version 1.68f99). So I've gone to update the firmware only to find I'm not able to do that either. When I try to click on any firmware updates I get the message "This software is not supported on your system." I'm feeling a bit stuck and like I'm going round in circles. What should I try next? I'm really hoping I can avoid having to do a clean install as I'm not sure my skills are up to it!
MacBook Pro, OS X Yosemite (10.10.3)