Worry-free repair: Use 360 ​​USB disk repair tool to easily solve USB disk failures and quickly restore data

1. Check the activation status in the settings; 2. Use the command prompt to check the activation status; 3. Check whether there are watermarks or restrictions; 4. Verify whether the system is genuine. To confirm whether Windows is genuine and activated, first open "Settings" → "System" → "About" → "Activate" to view the status, and it is normal to display "Windows is activated"; secondly, you can run the commands wmic and slmgr with administrator permissions to view the license details; if the desktop has a "Activate Windows" watermark, it means that it is not activated; finally, use "Windows Specifications" to confirm that the system type is retail or OEM version, and use Microsoft's official tools to verify the authenticity of the system.

Connecting a second monitor when installing a Windows system will not affect the installation process, but the following things need to be paid attention to to ensure that the dual screens work normally: 1. There may be only one screen display during the installation process, and the main display device in the BIOS can be adjusted or the interface can be replaced; 2. After the installation is completed, select the display mode through Win P, and adjust the resolution, position and main display in the display settings; 3. If there is a black screen or unrecognizable situation, check the cable, update the driver or enter safe mode to reinstall the driver; 4. When using monitors with different resolutions, set the appropriate zoom ratio and enable the zoom repair option to optimize the display effect.

Before updating macOS, you should back up your Mac. 1. Use TimeMachine to make a complete backup, insert the external hard disk and enable automatic regular backup; 2. Manually back up important files to cloud storage or external devices, and give priority to backing up documents, photos, bookmarks and other key information; 3. Create a bootable macOS installation disk for system repair or reinstallation, prepare a 16GB USB disk and run terminal commands to create. Backup can effectively prevent update failure or data loss, and it is more secure to prepare in advance.

Making a macOS bootable installer on Windows is not officially supported, but can be implemented through third-party tools. First, prepare a USB drive above 16GB, macOS installation image (.dmg/.iso) and tools such as TransMac or balenaEtcher; secondly, use TransMac to right-click the USB drive and select "RestorewithDiskImage" to write the image, or use balenaEtcher to select ISO files and target disk to write; finally note that the USB drive must be in GPT format, and install Hackintosh, you also need to manually configure EFI boot and use boot tools to bypass restrictions.

To clean macOS update files, you can manually delete the update packages in /Library/Updates and /var/folders, or use the terminal command sudorm-rf/Library/Updates/* to delete them, or use CleanMyMacX, DaisyDisk and other tools to clean up the system cache; however, be careful to confirm that the update has been completed before deletion and keep the necessary files for rollback.

Installing macOS to Dell laptops is feasible but requires hands-on ability. 1. Prepare supported Dell laptops, USB drives, macOS environments and EFI files; 2. Use OpenCore or UniBeast to create a boot disk and adjust the BIOS settings; 3. Handle driver problems such as graphics cards, network cards, etc. when installing the system; 4. Use configuration tools to optimize EFI repair power management; 5. Pay attention to system update compatibility during daily maintenance and use the community to solve problems.

You can return the macOS version, but the operation is complicated and risky. 1. Use TimeMachine to roll back the system: the premise is that the backup has been turned on and the complete mirror has been made. The entire system will be restored to a certain time point during operation, resulting in the loss of subsequent new data; 2. Manually reinstall the old version of macOS: you need to prepare to start the USB drive, erase the system disk and install the old version. The process is cumbersome and will clear all current data; 3. Data backup and precautions: No matter which method, you must back up the data in advance, pay attention to the limitations of the system version of different models, and Apple officially stops signing of the old version, and it will be difficult to downgrade, and the M series chip models are particularly limited.

You can install macOS without using AppleID, but some functions are limited. There is no need to force login to AppleID during the installation process. You can create a local account to use the basic functions of the system. However, functions such as iCloud synchronization, AppStore download, and search for my Mac require AppleID to enable it. 1. When installing, you can use the USB drive to boot disk or recovery mode to create a local account; 2. Local account can browse web pages, edit documents, program development, and play media, but it is impossible to use iCloud and download most AppStore applications; 3. Skip AppleID to log in for the first time to create a local account; 4. Suitable for computer room equipment, development and testing, and privacy-sensitive users, and it is recommended to bind Apple to long-term use.