What is HackinDROM?
[HackinDROM is an] OpenCore bootloader EFI updater [that] works on macOS Catalina and newer. -https://github.com/Inqnuam/HackinDROM
Things You Will Need
- A USB flash drive at least 512 MB https://amzn.to/3wkR5ju | https://amzn.to/3qkrJ1p | https://amzn.to/3Nhu9b9
- Download HackinDROM Download
- Open Downloads in Finder
- Right click HackinDROM > Open > Click OK to confirm opening the application
- Click on HackinDROM in the menu bar
- Click Skip to skip setting up the motherboard settings
- Click Mount across from the current startup disk
- Authenticate to allow mounting the EFI partition
- Copy the EFI folder from the EFI partition to a USB flash drive as a backup in the event MacOS won't boot after updating OpenCore
- Back in HackinDROM, right click the current startup disk > Update
- After the update completes, double click Unmount across from the current startup disk
- Reboot MacOS to verify the system still boots successfully
Source: https://www.tonymacx86.com/threads/hackindrom-app-for-opencore-efi-creation-and-update.312176/