Hi qtm, You modified my W520 BIOS a few posts back. I am SO happy! I still cannot get a WWAN card to be recognized, but I will wait for my official one to figure that out. It doesn't appear in Device Manager or lspci or MacOS System Profiler (Sierra MC8790). More importantly, though, how will I go about modifying the BIOS myself in the future when new BIOS versions are released? Can you provide some guidance or simple instructions? I have Andy's tool and Ender's tool. Is there anything else I need? Thanks so much and keep up the great work! Regards, Barrett