OpenCoreAPFSloader
Custom Bootloader for any unsupported Catalina EFI Mac
to detect any HFS, APFS, APFS dmg, ramdisk and hidden apple volumes from any unsupported Catalina Mac
to load any stock macOS Recovery, macOS installer, and macOS patched installation also from external usb devices
Check here for more info: https://forums.macrumors.com/threads/macos-10-15-catalina-on-unsupported-macs.2183772/post-28326528