Reinstall Macos Catalina From Big Sur

1. Reinstall Macos Catalina After Big Sur
2. Reinstall Macos Catalina From Big Sur Windows
3. How To Update To Macos Big Sur
4. How To Downgrade Big Sur To Catalina

Install macOS Catalina on a bootable drive. It might seem a bit counterintuitive, but you have to install macOS Catalina on an external drive before you erase Big Sur. This requires some Terminal work, which we’ll guide you through in a minute. Before that, make sure your Mac can boot from external media.

From Jun 2020 to Aug 2020, Apple has released several beta versions for macOS 11 Big Sur, both developers and testers can install and run it on a supported Mac. You may be one of them, starting to use this new macOS but unfortunately run into some issues and want to revert to previous Catalina or Mojave version.

1. Clean Install macOS Catalina Using Internet Recovery Method. Power down your Mac completely. Power your Mac back on and hold down the Command + Option + R keys until you see a.
2. I installed Big Sur on top of Catalina and there have been no problems whatsoever. I would not worry about something going wrong. A modern OS whether it's macOS, Linux or Windows 10 all incorporate fail safe measures to insure little to nothing goes wrong.

No worries, here we will list the easy steps to downgrade macOS Big Sur to Catalina without losing data.

Recover Data After Mac Downgrade

• Recover files lost due to macOS update, downgrade, crash, etc.
• Recover lost, deleted, formatted data
• 5 recovery modes: Basic, Advanced, Formatted Drive, Trash, Extenal Devices
• Recover files from internal and external hard drive (USB, SD Card, Media Player)
• Support file recovery on 200+ formats: video, audio, photo, docs, etc.
• Preview files before recovery

Why We Need to Downgrade Big Sur to Catalina?

MacOS 11 Big Sur is absolutely the biggest update these years since it has moved from 10 to 11, you can find a bunch of update as following in Big Sur:

• New design
• Intuitively customized Safari browser
• Updated Messages app (better control of conversation)
• Redesigned Maps for better and easier navigation
• Improved transparency for Mac App Store downloads
• Expanded photo editing features
• Faster updates to the latest version

……

All the revealed new updates added to macOS11 Big Sur stimulate mac users to upgrade and take the first bite on this macOS version. But later, there occurs problems and some of them want to revert to the previous Catalina version for one or another reasons:

• The Beta version is not perfect, you want to download the official version later;
• It takes longer time to get used to the new version and you don’t want to waste time;
• MacOS 11 Big Sur keeps causing problems;
• Your hardware is not highly compatible on this new version (compromised audio, video or image quality);
• Your favorite app doesn’t work on the new version;

…… C3-00 driver download.

No matter what your reason is to revert to an older version, you can refer to following part to downgrade from Big Sur to Catalina without losing data.

How to Downgrade Big Sur to Catalina without Losing Data?

To downgrade Big Sur to Catalina without losing data, here are 6 steps to follow. Before the downgrade, your data matters the most, so don’t forget to back them up though it takes time to finish a backup.

Step 1. Prepare your Mac for downgrade

You should quit running programs and leave enough space (15GB to 20GB) to install Catalina after erasing Big Sur from your Mac hard drive. Also, make sure your mac is connected to the internet for later macOS installer download.

Step 2. Backup files (Important and Required)

It is safe to upgrade or downgrade a macOS version, there is no harm done to your files or data, but data loss after mac update or reversion happens sometimes. If you don’t want to render your data under any potential risks, you are highly recommended to back up files.

There are 2 ways to back up file, either back up your files to an external hard drive with Time Machine or upload your data to cloud-based service for storing, like iCloud, DropBox, OneDrive. But here Time Machine backup is recommended.

1. Connect an external hard drive for backup to your mac;
2. Run Time Machine and set it up for backup;
3. Click on the Time Machine icon in menu bar, choose Back up Now;
4. Wait for the backup to finish.

Step 3. Erase macOS 11 Big Sur from your Mac

1. Click Apple icon and go to Restart;
2. Hold down Command+R when rebooting to reboot your mac in Recovery Mode;
3. In the pop-up interface, choose Disk Utility>Continue;
4. Then select your Startup Disk, click on Erase tab;
5. Choose APFS or macOS Extended format and confirm to Erase.

Step 4. Install macOS Catalina or Mojave

There are 3 methods to install older macOS version on your mac.

Method 1. Download from Mac App Store and Install

1. Launch Mac App Store;
2. Search macOS Catalina or Mojave, click Download;
3. When the download finishes, follow the on-screen instructions to install macOS Catalina or Mojave;

Method 2. Reinstall macOS Catalina or Mojave from Internet

1. Click on Apple logo>Restart;
2. Hold down Command+R when rebooting your mac;
3. In the pop-op macOS Utilities interface, choose Reinstall macOS>Continue;
4. Agree to the terms and follow the instructions to download and install.

Method 3. Reinstall macOS Catalina or Mojave from Bootable Drive

1. Create a bootable drive of macOS Catalina or Mojave
2. Connect the bootable drive to your mac;
3. Click on Apple logo>Restart;
4. Hold down Option when rebooting your mac;
5. Choose the bootable drive with macOS Catalina or Mojave installer;
6. Click on Continue, agree to the terms and install a previous macOS version onto your mac.

Step 5. Restore Backup with Time Machine

The only change you want for the downgrade is turning back to a previous macOS version, but you want the files and settings the same as before. In this case, you should restore both your files and settings from a Time Machine backup.

1. Click on Apple Logo>Restart;
2. Hold down Command+R during mac rebooting;
3. Choose Restore from Time Machine Backup from the macOS Utilities interface and click on Continue button.
4. Choose the Time Machine backup disk>Continue;
5. Select the latest backup, click Restore>Continue.

Step 6. Check if everything is back now!

Now, run your apps on macOS Catalina and check if everything goes well. Android composite adb interface driver.

If the downgrade still causes problems, restart your mac or reinstall Catalina/Mojave to fix it.

What If Data Lost/Deleted after macOS Big Sur Downgrade?

But what if we still got data lost or deleted after macOS Big Sur downgrade to Catalina or Mojave? You can recover them back with Time Machine backup by following the tutorial in above Step 5. If this still cannot get back your files, you need a professional data recovery program---Cisdem Data Recovery.

Cisdem Data Recovery is a program to recover lost, missing, deleted, formatted files from both internal and external hard drive on mac. It applies to data loss due to system crash, update or downgrade, also supports file systems like APFS, HFS+, FAT16, FAT32, exFAT, NTFS, etc.

Main Features of Cisdem Data Recovery

• Recover lost, deleted, formatted data;
• 5 recovery modes enable users to recover files lost under different situation;
• Recover files from internal and external hard drive (USB, SD Card, Media Player)
• Support file recovery on 200+ formats: video, audio, photo, docs, etc.;
• Support various file systems: APFS, NTFS, HFS, FAT, etc.;
• Preview files before recovery;
• High recovery rate;

How to Recover Data After macOS Downgrade from Big Sur to Catalina?

1. Download and install Cisdem Data Recovery to your Mac;
   Free Download
2. Choose a data recovery mode basing on your need. Basic mode runs a quick scan, while Advanced mode runs a deep scan;
3. Select the location where you lost the files and click Scan;
4. Preview the found files; All the founded files will be categorized in different folders, check the file and preview before recovery;
5. Select the found file and recover them onto your mac. Check the box before found files, stop the scanning process if you want to recover before the end of a scanning process. Click Recover to get all lost files after macOS Big Sur downgrade back to your mac.

Conclusion

No matter you want to downgrade from Big Sur to Catalina or Mojave without losing data, or just want to upgrade from an earlier version to the latest macOS, the backup process is mandatory in case of any data loss. If a data loss happens and you don’t have a backup, you will need a dedicated program like Cisdem Data Recovery to do the job.

Big Sur has just arrived in November, and we are sure that some users installed it without doubts but regret later. Maybe you don’t like the new features of this system or some apps do not work correctly, or maybe you’ve got trouble with Big Sur and it forces you to downgrade your MacOS back to Catalina. In fact, it’s possible to do this but we want to say it is not so easy.

In our article, we’ve gathered useful hints on how to downgrade the OS of the Mac to a previous one. Keep reading to do it without problems and enjoy working on your computer!

Why Do Users Wish to Downgrade?

Big Sur contains some new features and new changes to be a good update to the Mac OS. However, some users prefer to stay with Catalina just because they are used to that operating system or discovered some troubles with any new updates. Here are the main reasons why some people wish to downgrade their Macs:

Reinstall Macos Catalina After Big Sur

• Some apps don’t work correctly, as an example, you may discover that your current version of Corel Draw doesn’t work anymore.
• Some people may need Catalina OS for their recurrent job, and they are not ready to change the operating system.
• Some users may try a new operating system but later they wish to downgrade just because they don’t like it and prefer the older version.

Please be informed that downgrading is not similar to a process if you would find a Catalina version and reinstall it on your device. When the Mac is having the newest OS version, the entire process of downgrading will be different but it’s still possible.

Keep reading to see the main hints to downgrade the computer.

1. Backup The Device At Start

The very first step is to back up the computer. The downgrading will eventually erase everything from its hard drive, and it means you have to create backups to keep all your important files safe. Check out if you have copied all the needed files and didn’t forget anything.

Please be informed that you don’t need a Time Machine for making backups just because if you recover your files from a backup made with a Time Machine in the Big Sur system, you will receive Big Sur files. Just use a reliable backup tool to back up all the needed recent documents.

If you create backups regularly, then you may find an older backup made with Catalina Time Machine, and this is just an ideal situation. It means you may recover the Mac and then copy on it all the needed documents from those backups.

Sometimes it’s easy to do everything without any backups if you store all the important files and documents in iCloud. Please remember that with a Time Machine it’s possible to backup settings too that are very comfortable for recovering.

Reinstall Macos Catalina From Big Sur Windows

2. Downgrade Your Mac

How To Update To Macos Big Sur

If you’ve updated your Mac’s OS to Big Sur but now want to change the OS due to any reason, it’s possible to downgrade back without worries. In fact, you may use two variants below:

• Recover the device from a Time Machine backup made with Catalina OS. Check out that you have a full backup of the device’s system you had before it was upgraded. Please remember that all files you’ve saved since your computer was upgraded will be deleted If you still need any files, don’t forget to save them on iCloud or the flash drive.
• Reinstall your OS with a bootable installer. Of course, it means you have to delete everything from the hard drive. You may lose all your information if you don’t create any backups or save it anywhere before. Please remember that you should not use a Time Machine in Big Sur because it’s not effective at all.

How To Downgrade Big Sur To Catalina

Download advent dt2412 driver. As you see, downgrading is not a very complicated thing but you must be very attentive to not lose any important files.