Just wiped my hard drive on my MacBook Pro from 2013. Went to install a new copy of MacOS Sierra. I get the following error:
I looked online and tried change the date using the Utility Terminal and the following command:
csrutil enable csrutil clear
Then I tried clearing the NVRAM using command + option + P + R on startup.
Still no luck. Still getting the same error message. Apple support told me to go to a "computer repair store".