MacBook Pro shows circle with diagonal line and won't boot up

You just need to reinstall the update . No need to erase the hard drive.

My (purchased in 2011) MacBook Pro did same thing when I tried to update.

Mine says the driver could not be located

error message says “the recovery selected could not be located”

I have the same problems and after tried your advice it WORKS. Thank you so much for your sharing, you save our mac.

MacBook Pro won’t shut down

I followed ur directions but keep getting the response “ the recovery server could not be contacted”. I am connected to my home wifi, any thoughts on how to fix this? Thanx in advance!

How long should this take?? It’s been 2 hours so far and my screen has said about 15 mins remaining the entire time.

Hey it takes about 1:30-2 hours depending on

the speed of internet. If the loading bar doesnt move . Just restart it from the beginning .

Thanks it worked took a few attempts would refuse to download but once downloaded installation was smooth- All data saved

How do fix the circle with diognal line on your screen

I had the same issue and did what you said to do. Now it’s sayinf for me to update macOS High Sierra and to continue I have to “unlock Macintosh HD” is this something I should do?

Thanks so much. I was worried I might lose desktop files. All OK.