$ /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"

$ uname -m | grep arm64 && echo 'export PATH=$PATH:/opt/homebrew/bin' >> ~/.zshrc && source ~/.zshrc

Step 2: disable Homebrew analytics

brew analytics off

Step 3: install GnuPG

brew install gnupg

Step 4: import “Tails developers” PGP public key

$ curl https://tails.boum.org/tails-signing.key | gpg --import
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1341k  100 1341k    0     0  1451k      0 --:--:-- --:--:-- --:--:-- 1450k
gpg: key 0xDBB802B258ACD84F: 2170 signatures not checked due to missing keys
gpg: key 0xDBB802B258ACD84F: public key "Tails developers (offline long-term identity key) <tails@boum.org>" imported
gpg: Total number processed: 1
gpg:               imported: 1
gpg: key 0xA3A31BAD5A2A5B10: no user ID for key signature packet of class 10
gpg: marginals needed: 3  completes needed: 1  trust model: pgp
gpg: depth: 0  valid:   3  signed:   0  trust: 0-, 0q, 0n, 0m, 0f, 3u

imported: 1

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Step 5: download Tails release

Go to https://tails.boum.org/install/download/index.en.html and download latest release and associated PGP signature (found under “or download the OpenPGP signature”) to ~/Downloads folder.

Step 6: verify Tails release (learn how here)

Heads-up: replace 4.25 with latest release semver.

$ gpg --verify ~/Downloads/tails-amd64-4.25.img.sig
gpg: assuming signed data in '/Users/sunknudsen/Downloads/tails-amd64-4.25.img'
gpg: Signature made Mon  6 Dec 11:19:38 2021 EST
gpg:                using RSA key 05469FB85EAD6589B43D41D3D21DAD38AF281C0B
gpg: Good signature from "Tails developers (offline long-term identity key) <tails@boum.org>" [unknown]
gpg:                 aka "Tails developers <tails@boum.org>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg:          There is no indication that the signature belongs to the owner.
Primary key fingerprint: A490 D0F4 D311 A415 3E2B  B7CA DBB8 02B2 58AC D84F
     Subkey fingerprint: 0546 9FB8 5EAD 6589 B43D  41D3 D21D AD38 AF28 1C0B

Good signature

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Step 7: copy Tails to USB flash drive or SD card

WARNING: DO NOT RUN THE FOLLOWING COMMANDS AS-IS.

Heads-up: run diskutil list to find disk ID of USB flash drive or SD card to overwrite with Tails (disk4 in the following example).

Heads-up: replace diskn and rdiskn with disk ID of USB flash drive or SD card (disk4 and rdisk4 in the following example) and tails-amd64-4.25.img with current image.

$ diskutil list
/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         500.3 GB   disk0
   1:             Apple_APFS_ISC                         524.3 MB   disk0s1
   2:                 Apple_APFS Container disk3         494.4 GB   disk0s2
   3:        Apple_APFS_Recovery                         5.4 GB     disk0s3

/dev/disk3 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +494.4 GB   disk3
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD            15.3 GB    disk3s1
   2:              APFS Snapshot com.apple.os.update-... 15.3 GB    disk3s1s1
   3:                APFS Volume Preboot                 328.4 MB   disk3s2
   4:                APFS Volume Recovery                815.1 MB   disk3s3
   5:                APFS Volume Data                    439.3 GB   disk3s5
   6:                APFS Volume VM                      7.5 GB     disk3s6

/dev/disk4 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *32.1 GB    disk4
   1:               Windows_NTFS Untitled                32.1 GB    disk4s1

$ sudo diskutil unmount /dev/diskn
disk4 was already unmounted or it has a partitioning scheme so use "diskutil unmountDisk" instead

$ sudo diskutil unmountDisk /dev/diskn (if previous step fails)
Unmount of all volumes on disk4 was successful

$ sudo dd bs=1m if=$HOME/Downloads/tails-amd64-4.25.img of=/dev/rdiskn
1139+0 records in
1139+0 records out
1194328064 bytes transferred in 49.463690 secs (24145551 bytes/sec)

$ sudo diskutil unmountDisk /dev/diskn
Unmount of all volumes on disk4 was successful

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