In the macOS Utilities list, choose Reinstall macOS.Immediately press and hold Command + R keys until you see the Apple icon or other images.But to avoid any bad surprises, it's a good idea to back up your Mac first. With the macOS Recovery Mode, you can reinstall the latest version of macOS that is currently or recently installed. MacOS Recovery Mode is the ultimate solution for you. Log in to your Mac and update your Mac.(You can see the Safe Boot words in the right corner of the login window.) Press and hold the Shift key until the login window appears.If your Mac fails to boot up because of a black or blank screen, you can update your Mac in Safe Mode. Safe Mode can solve a lot of problems with Macs. When your Mac reloads, try to update your macOS.Immediately press and hold Command + Option + P + R keys. Regarding this case, you can reset your NVRAM. However, they may also make your Mac run problematic. These preference files help your Mac run smoothly, and they will not be erased even if you turn off your Mac. It stores your Mac's preferences such as date, time, desktop, mouse, and so on. NVRAM is short for Non-Volatile Random Access Memory. If there are no issues with Apple's servers, try the next step. (Green means available, while red or yellow means issues with Apple's servers, and there is nothing you can do but wait. Find the macOS Software Update and see its status. What you need to do is go to Apple's System Status page to check if there is a problem with Apple's servers. Update problems occur when Apple's servers are experiencing issues. Check If There Are Issues with Apple's Servers In this case, you can press and hold the Power button, turn off your Mac, and then restart your Mac to see if the update is successful. If your Mac is stuck on a screen for over 10 minutes, most likely, your update has failed. Related Article: Mac Won't Connect to Wi-Fi? Here's the Fix 4.
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