Bless error when installing rEFInd

I am trying to install rEFInd on my MacBook Pro 2018 laptop with the new T2 chip that adds extra boot security. I have both used APFS and MacOS Extended (Journaled). I have also disabled secure boot and csrutil. When I install rEFInd using sudo ./install.sh --alldrivers --ownhfs /dev/disk0s3 (where disk0s3 is my MacOS Extended (Journaled)), I then get an error when selecting the rEFInd disk in the Startup Disk, I end up getting an error saying that there was a bless error. How would I install rEFInd on my MacBook Pro 2018 laptop? **Edit**: If it helps, I am on macOS High Sierra and will soon be updating to macOS Mojave in the next few weeks. This is also the format of my disk: /dev/disk0 (internal): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme 500.3 GB disk0 1: EFI EFI 314.6 MB disk0s1 2: Apple_APFS Container disk1 499.7 GB disk0s2 3: Microsoft Basic Data BOOTMGR 307.2 MB disk0s3 /dev/disk1 (synthesized): #: TYPE NAME SIZE IDENTIFIER 0: APFS Container Scheme - +499.7 GB disk1 Physical Store disk0s2 1: APFS Volume Macintosh HD 199.5 GB disk1s1 2: APFS Volume Preboot 44.6 MB disk1s2 3: APFS Volume Recovery 1.0 GB disk1s3 4: APFS Volume VM 1.1 GB disk1s4