# macOS Catalina

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Mac : Factory reset / Fresh install ( macOS Catalina )
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### Prerequisites

* Back up your data (optional but recommended)
  * Use Time Machine with an external drive if backing up
* Ensure stable internet connection
* Have enough time (process can take up to some hours)
* Power connection recommended

### Step 1: Enter Recovery Mode

1. Turn off your Mac or restart it
2. Press and hold `Command (⌘) + R` immediately upon startup
3. Keep holding until you see the Recovery screen
4. Verify your Wi-Fi connection in Recovery Mode

### Step 2: Erase Your Drive

1. Open **Disk Utility** from Recovery Mode
2. In the sidebar, look for:
   * "Macintosh HD" (main drive)
   * "Macintosh HD - Data" (if present)
3. If you see "Macintosh HD - Data":
   * Select it
   * Click the `-` (minus) button
   * Click "Delete" to remove it
4. Select the main "Macintosh HD"
5. Click "**Erase**" at the top
6. Keep default settings
7. Click "**Erase**" to confirm
8. Click "**Done**" when complete
9. Exit Disk Utility

### Step 3: Reinstall macOS

1. Select "**Install macOS**"
2. Click "**Continue**"
3. Accept the terms and conditions
4. Select your hard drive (Macintosh HD)
5. Click "**Install**"
6. Wait for the installation process (up to 5 hours)

### Step 4: Initial Setup

1. Select your country
2. Choose your Wi-Fi network and connect
3. Time Machine backup options:
   * Restore from backup (if you have one)
   * Skip ("Not now") for fresh start
4. Apple ID options:
   * Sign in with Apple ID
   * Select "Set up later" to skip
5. Accept terms and conditions

### Step 5: Create User Account

1. Enter account information:
   * First name
   * Last name
   * Account name
   * Password
   * Verify password
2. Click "**Continue**"

### Step 6: System Preferences

1. Choose your preferences:
   * Siri settings
   * Analytics sharing
   * Dictation improvements
2. Select appearance:
   * Light mode
   * Dark mode

### Important Notes

> ⚠️ **Warning**: This process will erase all data from your Mac. Back up important files before proceeding.

* Installation time varies based on:
  * Internet speed
  * Computer specifications
  * Drive size
* Your Mac will restart multiple times during the process

### Troubleshooting Tips

* If Recovery Mode doesn't appear:
  * Restart and try again
  * Make sure to press keys immediately after startup sound
* If installation fails:
  * Check internet connection
  * Ensure enough disk space
  * Try resetting SMC/NVRAM if needed

### After Installation

1. Install necessary applications
2. Configure system preferences
3. Restore data from backup (if needed)
4. Check for system updates

***

*Note: This guide is specific to macOS Catalina. Steps may vary for other macOS versions.*