uninstall mac software on a mac book pro laptop
How can I uninstall macOS Big sur and reinstall catalina 10.15 instead?
MacBook Pro
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Find an Apple Authorized Service Provider and find one nearest your location. As for Cost - Only Apple could answer that question. We are only Apple Users like yourself.
Backup, create a bootable Catalina USB flash installer and boot it and erase the internal device as APFS and install Catalina to it, restore from the backup.
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uninstall mac software on a mac book pro laptop