I was successfully running 10.11.6 and had previously updated from 10.11.5 successfully. Today I decided to install an update for iTunes. I had my Clover USB inserted, because I had been using that to boot into my OS X installation (Windows update had broken the default boot and I hadn't bothered to fix it quite yet). Strangely, the update deleted everything on the USB EFI partition. I made another USB installer using Unibeast and didn't modify it at all. When booting to my Mac SSD, I get a freeze right at the Apple logo. Does anyone have any recommendations for the best path to recovery? I'm not exactly sure where to start. I tried searching the forums but only found one thread with my problem, and it had no replies. Thanks in advance for any help!