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doc/md/Installation_Instructions/Mac-OS-X-Homebrew-Installation-Instructions.md

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+## Homebrew (Mac OS X)
+These instructions comes from @Chrisfu, where I got the proxmark3.rb scriptfile from.
+Further questions about Mac & Homebrew,  contact @Chrisfu  (https://github.com/chrisfu/)
+
+1. Install homebrew if you haven't yet already done so: http://brew.sh/
+
+2. Tap this repo: `brew tap RfidResearchGroup/proxmark3`
+
+3. Install Proxmark3: `brew install proxmark3` for stable release or `brew install --HEAD proxmark3` for latest non-stable from GitHub.
+
+Upgrading HomeBrew tap formula
+-----------------------------
+*This method is useful for those looking to run bleeding-edge versions of iceman's client. Keep this in mind when attempting to update your HomeBrew tap formula as this procedure could easily cause a build to break if an update is unstable on macOS.* 
+
+Tested on macOS High Sierra 10.13.2
+
+*Note: This assumes you have already installed iceman's fork from HomeBrew as mentioned above*
+
+1. Force HomeBrew to pull the latest source from github
+`brew upgrade --fetch-HEAD RfidResearchGroup/proxmark3`
+ 
+2. Flash the bootloader & fullimage.elf
+  * With your Proxmark3 unplugged from your machine, press and hold the button on your Proxmark 3 as you plug it into a USB port. Continue to hold the button until after this step is complete and the `proxmark3-flasher` command outputs "Have a nice day!"*
+   `$ sudo proxmark3-flasher /dev/tty.usbmodem881 -b /usr/local/Cellar/proxmark3/HEAD-6a710ef/share/firmware/bootrom.elf /usr/local/Cellar/proxmark3/HEAD-6a710ef/share/firmware/fullimage.elf`
+
+
+`$ sudo proxmark3-flasher /dev/tty.usbmodem881 `
+
+4. Enjoy the update