RANGER GAMEZ

Apple Device Support · chapter 14 of 18

Month 7: The Mac that needed a fresh start

In this chapter Objectives 3.1, 3.5, 3.6, 3.7, 3.8

  1. Recognizing issues during Mac setup
  2. Why start up in macOS Recovery
  3. Reinstalling macOS from macOS Recovery
  4. Erasing a Mac: Erase Assistant, Disk Utility or Apple Configurator
  5. Reviving or restoring a Mac with Apple Configurator or the Finder
  6. Erasing a Mac three ways
  7. When Mac setup goes sideways
  8. Practice questions
  9. Chapter recap

Objective 3.1

Recognizing issues during Mac setup

Enrollment and network problems

A company Mac should show Remote Management ('Your organization is managing this Mac') in Setup Assistant. If it doesn't, or says 'Enrolling with management service failed. Retry.', check the network first: the Mac must reach Apple's servers (such as deviceenrollment.apple.com). With no Wi-Fi it may skip Remote Management entirely, so use Ethernet if needed. Then confirm the serial number is assigned to the right service in Apple Business Manager.

Exam tip If enrollment fails, the Mac behaves like an unmanaged Mac. Tell the device management administrator.

Other setup snags

Not every setup problem is about MDM.

  • 'Setting up your Mac' takes ages and apps are missing: check app licenses and assignments (some apps install later)
  • Apple Account sign-in fails: check Apple System Status, test at account.apple.com, or skip and sign in later in System Settings
  • Activation Lock screen after an erase: the Apple Account that turned on Find My, or the organization's bypass code

Check yourself 1During Mac setup, the Wi-Fi Network prompt appears, but the office Wi-Fi isn't set up yet. What does Apple suggest so the Mac doesn't skip Remote Management?

  1. Use an Ethernet connection instead
  2. Skip the network step and enroll later from System Settings
  3. Join an iPhone's Personal Hotspot that blocks Apple servers
  4. Turn off Location Services to speed up setup
Show the answer

Answer: A. Use an Ethernet connection instead

Without network access, the Mac may skip Remote Management enrollment entirely. Apple suggests choosing an available network or using an Ethernet connection if Wi-Fi isn't available.

Check yourself 2A new company Mac finishes setup without ever showing Remote Management. It was set up on a guest network that blocks Apple's servers. What happened?

  1. Its serial number isn't in Apple Business Manager
  2. It couldn't reach Apple's enrollment servers
  3. FileVault was already on
  4. The user skipped the Apple Account step
Show the answer

Answer: B. It couldn't reach Apple's enrollment servers

The Mac learns its device management assignment from Apple's servers. If the network blocks them, Remote Management doesn't appear and the Mac ends up unmanaged.

Objective 3.5

Why start up in macOS Recovery

A toolbox outside macOS

macOS Recovery is a separate system for when macOS can't fix itself: Disk Utility (First Aid, erase), Reinstall macOS, Restore from Time Machine, Safari for support articles, Share Disk, Startup Disk, Startup Security Utility and Terminal. On a Mac with Apple silicon: shut down, press and hold the power button until startup options load, click Options, then Continue.

Exam tip Reinstall and First Aid try to keep data, so Recovery comes before any erase.

Who can get in

With FileVault on, only someone with an administrator account on the Mac can use macOS Recovery. An organization can also set a recoveryOS password (Recovery Lock) from the device management service; the technician must enter it to get in.

Check yourself 3Which is a good reason to start up a Mac in macOS Recovery?

  1. To change the network service order
  2. To install App Store app updates
  3. To repair the startup disk with Disk Utility when macOS won't start
  4. To join and save a new Wi-Fi network for the whole office to use later
Show the answer

Answer: C. To repair the startup disk with Disk Utility when macOS won't start

macOS Recovery holds tools to repair the internal storage with Disk Utility, reinstall macOS, restore from Time Machine, use Terminal, set startup security and share the disk.

Objective 3.8

Reinstalling macOS from macOS Recovery

What a reinstall does

Reinstall macOS in Recovery puts back the system software while attempting to keep user data and settings. It installs the version of macOS the Mac was using, needs an internet connection, and fixes startup problems, missing system files or corruption that updates don't fix. Back up first anyway.

  • Standard reinstall: keeps data; minor to moderate issues
  • Erase and install: severe or persistent issues, or a Mac going to a new owner

Check yourself 4What does a Mac need to reinstall macOS from macOS Recovery?

  1. A Time Machine backup
  2. A USB installer drive
  3. A connection to the internet
  4. A second Mac with Apple Configurator
Show the answer

Answer: C. A connection to the internet

Apple: the Mac must be connected to the internet to reinstall macOS from macOS Recovery.

Objective 3.6

Erasing a Mac: Erase Assistant, Disk Utility or Apple Configurator

Erase Assistant: the quick way

Erase Assistant (System Settings > General > Transfer or Reset > Erase All Content and Settings) securely erases all data, settings and apps while keeping macOS and the firmware. It needs macOS 12 or later on a Mac with Apple silicon or the T2 chip. A Mac assigned to a service in Apple Business Manager re-enrolls automatically during setup afterward.

Exam tip Sign out of personal Apple Accounts first, or Activation Lock may stop setup.

Disk Utility and Apple Configurator

Disk Utility in macOS Recovery gives more control: erase or reformat the disk, then reinstall macOS. It's the way on older Macs without Erase Assistant. Apple Configurator on a second Mac can restore a Mac that won't start: firmware, recoveryOS and a fresh macOS. Supervised Macs may have Erase Assistant restricted by MDM; ask the admin, who can also erase remotely.

Check yourself 5Maya wants to wipe a Mac with Apple silicon for a new hire, keeping macOS installed, in the quickest way. Where does she go?

  1. Disk Utility in macOS Recovery to erase the disk, then Reinstall macOS from Recovery
  2. Apple Configurator > Restore from a second Mac
  3. System Settings > General > Transfer or Reset > Erase All Content and Settings
  4. System Settings > Users & Groups > Delete User
Show the answer

Answer: C. System Settings > General > Transfer or Reset > Erase All Content and Settings

Erase Assistant (Erase All Content and Settings) securely erases all data, settings and apps while keeping the installed macOS, so it's the fast way to repurpose a Mac.

Check yourself 6What does Erase Assistant remove from a Mac, and what does it keep?

  1. Removes macOS and all data, but keeps the user accounts
  2. Removes data, settings and apps; keeps macOS
  3. Removes only the current user's files
  4. Removes firmware and recoveryOS, keeps apps
Show the answer

Answer: B. Removes data, settings and apps; keeps macOS

Erase Assistant securely wipes all content and settings while keeping the firmware and the currently installed macOS.

Check yourself 7On a supervised company Mac, Erase All Content and Settings won't open. What is the most likely reason?

  1. FileVault must be turned off before Erase Assistant can run
  2. The device management service restricts Erase Assistant
  3. The Mac needs a firmware revive first
  4. Erase Assistant works only on personal Macs
Show the answer

Answer: B. The device management service restricts Erase Assistant

Erase Assistant works on Macs enrolled in device management, but administrators can restrict it on supervised Macs. Ask the device management administrator, who can also send a remote erase.

Objective 3.7

Reviving or restoring a Mac with Apple Configurator or the Finder

Revive vs restore on a Mac

After a power cut during an update, a Mac with Apple silicon may show an exclamation point in a circle, a blank screen or the firmware recovery light pattern. Revive updates the firmware and recoveryOS without changing the startup or data volumes. Restore also erases and installs the latest macOS. Try revive first.

  • Second Mac with macOS Sonoma 14 or later (Finder or Apple Configurator)
  • USB-C to USB-C cable that carries data and charging (Thunderbolt cables aren't supported)

Dev: Revive, then restore. Same order as the iPhones.

Ranger: Woof!

Check yourself 8Dev is preparing to revive a Mac from the Finder on a second Mac. Which cable does Apple say to use?

  1. A USB-C to USB-C cable that supports data and charging
  2. A Thunderbolt 4 cable
  3. A USB-C to USB-A cable
  4. Any USB-C cable, including a charge-only cable from a phone charger
Show the answer

Answer: A. A USB-C to USB-C cable that supports data and charging

To revive or restore a Mac, Apple lists the affected Mac, a second Mac with macOS Sonoma 14 or later and a USB-C to USB-C cable that supports data and charging. Thunderbolt cables aren't supported.

Check yourself 9After a power failure during a macOS update, a MacBook Pro with Apple silicon turns on but shows only a blank screen. Restarting doesn't help. What should you try?

  1. Reset NVRAM with Option-Command-P-R
  2. Restore from Time Machine in macOS Recovery
  3. Revive the firmware from a second Mac
  4. Run First Aid on the data volume
Show the answer

Answer: C. Revive the firmware from a second Mac

A power failure during an update can leave the firmware damaged. Apple lists starting to a blank screen, an exclamation point in a circle or the firmware recovery light pattern as signs to revive (then restore if needed).

Check yourself 10Maya wants to wipe a working Mac with Apple silicon for a new hire and keep macOS installed. What's the quickest way?

  1. Erase All Content and Settings in System Settings
  2. Disk Utility in Recovery, then Reinstall macOS
  3. Restore it from a second Mac with Configurator
  4. Delete the old user in Users & Groups
Show the answer

Answer: A. Erase All Content and Settings in System Settings

Erase Assistant erases all content and settings but keeps the installed macOS, so the Mac is ready for Setup Assistant quickly.

Go deeper

More on the objectives in this chapter, in the same exam-ready detail.

Objective 3.6 · Distinguish among methods for restoring Mac to factory settings using Erase Assistant, Disk Utility, or…

Erasing a Mac three ways

Pick the tool

Each tool fits a different situation.

  • Erase Assistant (General > Transfer or Reset > Erase All Content and Settings): wipes data, settings and apps, keeps macOS; Apple silicon or T2, macOS 12+
  • Disk Utility in macOS Recovery: erase or reformat, then reinstall macOS; works on any Mac
  • Apple Configurator from a second Mac: restore firmware, recoveryOS and macOS on a Mac that won't start
  • A Mac assigned in Apple Business Manager re-enrolls automatically after an erase; MDM can restrict Erase Assistant

Objective 3.1 · Recognize issues during Mac setup.

When Mac setup goes sideways

Common setup issues

Setup Assistant problems usually have one of a few causes.

  • No Remote Management or 'Enrolling ... failed': network access to Apple's servers, Ethernet, and the Mac's assignment in Apple Business Manager
  • Apps missing after 'Setting up your Mac': app licenses and assignments in MDM
  • Apple Account sign-in fails: Apple System Status, account.apple.com, or skip and sign in later
  • Activation Lock after an erase: the Apple Account that used Find My, or the organization's bypass code

Practice questions

Answer in your head, then open the answer. Ranger’s Device Doctor has 653 questions like these for Apple Device Support, with mock exams.

Question 1Rosa's office Mac keeps showing errors after a failed update, but her files are fine. Maya wants to put a fresh copy of macOS on it without erasing Rosa's data. What should she use in macOS Recovery?

  1. Disk Utility, Erase
  2. Reinstall macOS
  3. Recovery Assistant, Erase Mac
  4. Terminal, resetpassword
Show the answer

Answer: B. Reinstall macOS

Reinstalling macOS from Recovery replaces the system without removing the user's files. Erase in Disk Utility or Erase Mac in Recovery Assistant would delete everything.

Question 2During a recovery, a technician needs to read an Apple Support article on a Mac that cannot start macOS. What can she use from macOS Recovery?

  1. The Help Viewer from the Finder
  2. Recovery Assistant, which shows support articles
  3. The web browser in macOS Recovery
  4. The Mail app in macOS Recovery
Show the answer

Answer: C. The web browser in macOS Recovery

macOS Recovery includes a limited web browser (Safari) for troubleshooting and reading Apple Support articles. Mail and Messages are not available there.

Question 3Kibble & Co. is giving a retired Mac with Apple silicon to a local animal shelter. Maya wants every user account and all data removed. Which macOS Recovery option does this in one step?

  1. Reinstall macOS on Macintosh HD
  2. Startup Disk > Macintosh HD
  3. Utilities > Share Disk
  4. Recovery Assistant > Erase Mac
Show the answer

Answer: D. Recovery Assistant > Erase Mac

Erase Mac in Recovery Assistant removes every user account, password and file. Reinstall macOS keeps user data, so it is not enough before handing the Mac on.

Question 4A technician opens macOS Recovery on a Mac with Apple silicon. Which three tasks can be done from there? Choose three.

  1. Reinstall macOS
  2. Restore from a Time Machine backup
  3. Check and repair a disk with Disk Utility
  4. Install app updates from the App Store
  5. Remove login items in Activity Monitor
  6. Install a .mobileconfig profile by double-clicking it
Show the answer

Answers: A. Reinstall macOS, B. Restore from a Time Machine backup, C. Check and repair a disk with Disk Utility

macOS Recovery offers Reinstall macOS, Restore from Time Machine, Disk Utility, Safari, Terminal and Startup Security Utility. App updates, login items and profiles are handled after macOS starts.

Question 5A Mac with Apple silicon will not start, even into fallback recoveryOS. Dev plans to put it into DFU mode to revive it. What else does he need?

  1. A second Mac on macOS 14 or later and a USB-C cable
  2. A Time Machine disk connected to the failed Mac
  3. A bootable USB installer plus an Intel-based Mac to run it
  4. An Ethernet connection on the failed Mac only
Show the answer

Answer: A. A second Mac on macOS 14 or later and a USB-C cable

Reviving or restoring firmware needs a host Mac with macOS 14 or later (Finder or Apple Configurator), internet access and a USB-C data cable (not Thunderbolt 3) connected to the DFU port of the affected Mac.

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Apple, iPhone, iPad and Mac are trademarks of Apple Inc. Ranger Gamez is not affiliated with or endorsed by Apple. The practice questions are written to the published exam objectives; they are not real exam questions.