I've upgraded to Sierra but it was too buggy for me I decided to downgrade. I went through the process of creating a bootable USB El Capitan drive. I formatted Mactintosh HD and all of the sudden the copy of El Capitan cannot be verified. :| So I used Time Machine to restore the original OS X 10.10.5 on my 2015 MBP. However, i cannot login to my account and I tried to reset password via Terminal but I cannot connect to wifi. I tried to download El Capitan to re-do the USB in Guest account but when it reaches 80% it gives me an error. I tried several times. Going into Recovery, I see "re-install macOS Sierra", can that be changed?