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List of the table of contents of this article:

• 1, How to switch Apple Computer Dual System
• 2, How can Apple flash back to the previous system version?
• 3, How can Apple downgrade to the previous system version?
• 4、 How to install an Apple computer into a Windows system?
• 5, How to change the Apple computer system?

How to switch Apple Computer Dual System

Press the power button to turn on the power, and the power-on sound is remembered. When the gray-white screen appears on the screen, press the Option key immediately until the system start-up selection interface appears before let go. Then the system selection interface will appear. Press the left and right arrow keys to select the system we need to start. After selecting, click directly with the left mouse button or press Enter to confirm.

The steps for switching between Apple computers are as follows: Step 1: Press and hold "alt (opfion)" first, and then press the power button. Step 2: You will enter the selection page. Step 3: Select win8 to enter the windows page, as shown in the figure. Step 4: Select the second MACintos h HD (Mac) to enter the Apple system, as shown in the figure.

The method sets the default in the systemThe startup system, for example, I am currently in the Mac system, and I want to enter the Windows system directly when I start the computer next time.

Click the Apple icon in the upper left corner of the desktop of the Apple computer and wait for the sequence bar to pop up. Click the system preferences in the pop-up drop-down options to enter and wait to jump to the page. After jumping to the page, click the boot disk on the page of the system preferences to enter.

How can Apple flash back to the previous system version?

If you have downloaded the old version of the iOS system before and saved it locally, you can hold down the "Shift" key (Windows) or the "Option" key (Mac), and then click the "Restore iPhone" button. In the pop-up window, select the iOS system file you saved, and then wait for the recovery to complete.

Download the corresponding downgraded firmware version. When downgrading the iPhone system, download the corresponding downgraded firmware version. The specific download method is as follows: download the iPhone series through the iTools software toolboxThe unified version of the firmware, please pay attention to the corresponding ios system firmware version when downloading and querying.

Whether the iPhone can flash back to the original system depends on whether Apple has turned off the verification of the old version. For example, YES after iOS1 means that it can still be downgraded. When it is NO, it cannot be downgraded. If you can downgrade, the steps are as follows: go to Apple's official website to download the firmware that conforms to your device, and download the iTunes software on Apple's official website.

You can back up through iCloud or iTunes. Through iCloud Backup, you can find the iCloud option in the settings, then select Backup, and finally click "Backup Now". Through iTunes backup, you need to connect your iPhone to the computer, and then select the "Backup" option in iTunes.

Restore directly. Connect the device to the computer and open iTunes. Naturally, iTunes will recognize that there is a device that needs to be restored. Then click Restore and update, and then wait for a long time, and finally complete the activation! Firmware recovery. First of all, you need to download the corresponding firmware of the latest version. After downloading the firmware, put it on the desktop.

First of all, before the iPhone is downgraded to the old version of the system, please open the address ipsw.me below and click the iPhone option on the page.

How can Apple downgrade to the previous system version?

iPhone can downgrade the system version by flashing. First of all, you need to download the corresponding downgrade firmware package.You can find the corresponding firmware version on Apple's official website, download it and save it to your computer. Next, connect the mobile phone to the computer and open the flash tool, such as iTunes or third-party flash tool.

can achieve the purpose of reducing the system. Method 2: DFU mode recovery.

Download the old version of iOS firmware: Before downgrading, you need to download the old version of iOS firmware file that matches your device model. These firmware files can be found on some third-party websites or websites specializing in iOS firmware downloads.

How to install an Apple computer into a Windows system?

Make sure that your Apple computer meets the requirements for installing the Windows system, such as hardware and disk space.Open Launchpad on the Apple computer, find and open Boot Assistant. Click "Continue" to start the installation process.

Insert the boot disk into the USB interface of the computer, download the win7 system, and put it into the made USB boot disk.

First, we open the Apple desktop, find the "Go" function at the top, and find the "Utilities" button down. Entering the page, we found the "Bootcamp Assistant Tool". Click to open and continue. Click "Choose" to select the location of the windows10iso file. After selecting, click Open.

- Insert the USB flash drive into the Apple computer. - Open System Preferences and select Startup Disk. - In the startup disk options, select the Windows boot disk and restart the computer.- Press and hold the Option (or Alt) key during the startup process, and then select the Windows boot disk.

How to change the Apple computer system?

When turning on or restarting the computer, hold down the Opiton key, that is, the Alt key, for a long time for 2 to 3 seconds, it will switch to the screen, select the windows disk to start, and it is so simple to switch to the windows system.

The method is to restart the Apple computer first. During the startup process, press and hold the Opiton key for a long time for 2 to 3 seconds. Wait for the following interface on the Macbook to appear, and then you can select the system you want to start to enter.

First, open the Mac computer, enter the main interface, and then click the Apple logo in the upper left corner of the screen, as shown in the figure below.Next, a menu bar will pop up, and then select the "System Preferences" option inside. After entering the "System Preferences" interface, click the "Startup Disk" option inside.

The steps for switching between Apple computers are as follows: Step 1: Press and hold "alt (opfion)" first, and then press the power button. Step 2: You will enter the selection page. Step 3: Select win8 to enter the windows page, as shown in the figure.