Macbook asked me to update and gave the restart option. I did it but it says update failed and restart it.
I keep on doing restart but it not actually starting but again showing the same status restart because update failed.
It also gave me option to shutdown. I did and restarted but same screen was appeared.
Can you please suggest me what to do.
Thank you in advance for you help
Here is screen pic
After you repair the startup disk, give the installation another try.
Print this page so you can refer to it later. (You don’t have access to the Disk Utility User Guide when you restart your computer in the next step.)
In the Disk Utility User Guide window, click the Share button
, then choose Print.
Choose Apple menu
> Restart. After your Mac restarts (some Mac computers play a startup sound), press and hold the Command and R keys until the Apple logo appears, then release the keys.
Click Disk Utility, then click Continue.
Choose View > Show All Devices.
In the sidebar, select the disk you want to repair.
Click the First Aid button
.
If Disk Utility tells you the disk is about to fail, back up your data and replace the disk. You can’t repair it. Otherwise, continue to the next step.
Click Run.
If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following.
If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk.
If you can replace a file or re-create it, delete it.
If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted.
If Disk Utility can’t repair your disk or it reports “The underlying task reported failure,” try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.
While you'd have the option to use any of the above key combinations, Option-⌘-R sounds like the best for your situation.Reinstall from macOS Recovery
macOS Recovery makes it easy to reinstall the Mac operating system, even if you need to erase your startup disk first. All you need is a connection to the Internet. If a wireless network is available, you can choose it from the Wi-Fi
menu in the menu bar. This menu is also available in macOS Recovery.
1. Start up from macOS Recovery
To start up from macOS Recovery, turn on your Mac and immediately press and hold one of the following combinations on your keyboard. Command-R is generally recommended, especially if you never installed macOS Sierra 10.12.4 or later.
Command (⌘)-RInstall the latest macOS that was installed on your Mac.
Option-⌘-RUpgrade to the latest macOS compatible with your Mac.
Shift-Option-⌘-RInstall the macOS that came with your Mac, or the closest version still available.
Macbook pro-keep asking restart
