OpenCore Legacy Patcher
Experience macOS just like before
Built with security in mind
Supporting System Integrity Protection(SIP), FileVault 2, .im4m Secure Boot and Vaulting. You're just as secure as a supported Mac
Native OTA updates
Install updates the moment they come out just like on a supported Mac, and no more 12GB+ updates.
Zero firmware patching
No need to patch APFS ROM support, all protocol upgrades are done in memory and never permanent.