Install Refind Mac

First install at a minimum the refindx64.efi and refind.conf files to the /EFI/refind/ directory on the ESP, plus any icon files that you fancy. Then copy refindx64.efi and rename it as bootx64.efi in the /EFI/boot/ directory on the ESP. This bootx64.efi will boot by default, or is supposed to do so in a standard UEFI environment. When you are installing some OSes (e.g. Linux), they will overwrite refind’s files and prevent you from booting into refind (but booting into the fresh installed OS will work). If this happens, all you have to do is login into the OS you just installed and restore your refind backup.

Install Refind On Mac Os X
Macos Install Refind
Install Refind Macos High Sierra
Install Refind Mac Mini

This guide shall help you install the rEFInd Boot Manager in your T2 Mac in the safest possible way. Though there are various options to get rEFInd on your Mac, it is recommended to follow the instructions given below unless you know what you are doing.

All steps given here have to be performed on macOS. You will also need to have secure boot disabled.

Installing rEFInd. REFInd is easy to install; a simple Terminal command is all that's needed if you're using OS X Yosemite or earlier. OS X El Capitan and later has an additional security layer called SIP (System Integrity Protection). In a nutshell, SIP prevents ordinary users, including administrators, from changing system files, including.
REFInd is a fork of the rEFIt boot manager. Like rEFIt, rEFInd can auto-detect your installed EFI boot loaders and it presents a pretty GUI menu of boot options. REFInd goes beyond rEFIt in that rEFInd better handles systems with many boot loaders, gives better control over the boot loader search process, and provides the ability for users to define their own boot loader entries.
Install Apple's Bootcamp and use it to install Windows 10; Use Windows 10 to shrink the Bootcamp partition, freeing up space to install Linux; Install Linux (I used Kali) into the newly freed space; Install rEFInd as a Boot Manager for all 3 OSes; To be fair, a lot of my instructions and the guide I initially followed, can be found here.

With the help of disk utility, create a 100-200MB MS-DOS FAT partition and label it as REFIND.
Get a binary zip file of rEFInd from here.
The binary zip file of rEFInd shall be available in the downloads folder by the name of refind-bin-<VERSION>.zip, where <VERSION> represents the version of rEFInd you have downloaded. For eg:- If you have downloaded 0.13.2 version, it will be available as refind-bin-0.13.2.zip.
Extract the zip file (can be done by double clicking on it). The contents shall be extracted in a folder named refind-bin-<VERSION>. Here <VERSION> means the same as described in step 3.
Open the terminal and run diskutil list to get the disk identifier of the REFIND volume created in step 1. A sample output is given below:-

Here, the disk indentifier of REFIND volume is disk0s4.6. Now run the following in the terminal. Make sure you replace disk0s4 (found in 4th, 5th, 6th and 7th line of the command given below) with the disk identifier you got in the output as described in step 5 and refind-bin-0.13.2 (found in 1st line of the command given below) with the name of folder which was created in step 4.

Now run:-

This will changed the label in the Mac Startup Manager for rEFInd from EFI Boot to rEFInd.

Though rEFInd has many configuration options, some basic configuration is required for a smoother experience on T2 Macs.

Removing BIOS entries¶

Macs with T2 chip cannot BIOS boot. So it is advised to remove the BIOS entries. For that, open finder, and then open the REFIND volume. Add the line given below at the end of EFI/BOOT/refind.conf file by editing it with a text editor.

Install Refind On Mac Os X

In case you face the error saying The document “refind.conf” could not be saved., copy the refind.conf file to any place in your home directory (Downloads folder for example) and do the editing over there. After editing replace the refind.conf file in the REFIND volume with the newly edited file.

Hiding text on booting an OS using rEFInd (Optional)¶

In case you boot an OS other than macOS using rEFInd, it shows some debug text while booting it. In order to get a smooth boot experience simiar to the Mac Startup Manager, add the following line to EFI/BOOT/refind.conf, just as you did to remove BIOS entries.

Preventing use of NVRAM (Likely to have been enabled already)¶

Preventing use of NVRAM is must as T2 doesn’t like someone to touch the NVRAM. In latest editions of rEFInd, preventing use of NVRAM is enabled by default. You may confirm this by checking presence of use_nvram false line somewhere in the middle of the refind.conf file (the one mentioned in above instructions). Make sure it is not commented (doesn’t have a # before the line). If it is then remove the #.

In case the line is missing, add it at the end of refind.conf file.

In case the line use_nvram true is present instead, change true to false.

After correctly installing and configuring rEFInd, we need to make it boot by default on every startup. In order to do so, restart your Mac and press and hold down the Option key. When the startup manager gets displayed, release the Option key. Now press and hold the Control key and without releasing the Control key, boot into the rEFInd startup disk. Now on every startup, rEFInd will get displayed by default.

Note :- This step has to be performed every time you update macOS to a newer version, as this makes the macOS startup disk as the default startup disk.

Sometimes, while booting into macOS using rEFInd, users get stuck at a blank screen. This bug is observed only if you have performed a force/unsafe shutdown by pressing and holding the power button in the previous boot. Some users have also faced it in the first macOS boot using rEFInd on new rEFInd installations. In order to fix it, turn off your Mac and restart while holding down the Option key. Release the Option key when the Mac Startup Manager gets displayed. Boot into macOS using the Mac Startup Manager. This shall fix the bug for subsequent boots.

In case you wish to uninstall rEFInd, boot into macOS and follow the steps below :-

Open the Disk Utility
Select the partition on which macOS is installed (it generally has the label Macintosh HD until you have renamed it manually).
Click on Partition.
Select the REFIND partition and click - to remove it. Your macOS partition should expand to fill the space that rEFInd was in.
Click on Apply. Disk Utility will remove the REFIND partition and expand your macOS partition. This may take a while, but do not interrupt this process.
Change the default startup disk to the OS you wish to be boot by default.

Macos Install Refind

If the OS you wish is macOS or Windows, follow Apple's documentation where you have to follow the Change your startup disk for every startup section.

If the OS you wish is Linux, follow the Startup Manager Guide.

Reference - This guide has been inspired from here.