I'm using early 2011 i5 MacBook Pro. I upgraded to Sierra but the speakers and USB are not working and the system is very slow. Then I restarted my Mac with (cmd+alt/opt+R) to Recovery Mode. I cleaned my hard drive now I tried to reinstall Sierra but in the logs I saw it is downloading from the Internet. I stopped the installation and restarted my Mac. After the Apple logo it shows nothing but the 🚫.
Then I boot my USB drive to El Capitan but it is installing Sierra from the Internet... it takes days to download with my internet speed.