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+After browsing through multiple posts, I finally was able to install Qubes on a MacBook Air 13” mid 2011 (MacBookAir 4,2). I’m just sharing this, so ppl don’t need to read through multiple forums to understand how to do it.
+
+This model is features with:
+•	Dual Intel i7-2677M 1.80 Ghz CPU (2 dual cores)
+•	Intel HD Graphics 3000 
+•	4Gb RAM
+•	256Gb SDD
+•	Broadcom BCM43224 802.11 a/b/g/n wifi and Bluetooth adapter
+•	Intel DSL2310 Thunderbolt controller
+•	It has 1 DVI/Thunderbolt display port, 2 USB2.0 ports, a Magsafe power adapter, a standard 3.5mm audio jack and SD reader.
+
+First try to install Qubes using the UEFI boot failed, and not wanting to waste too much time, I quickly opted for the legacy BIOS install.  
+
+1.	Boot from MacOSX (or Internet Recovery Image with CMD+R during bootup).
+Run Terminal application as root [1]:
+~~~
+# diskutil list
+(find your usb device)
+# bless –device /dev/diskX –legacy –setBoot –nextonly  # bless the disk not the partition
+# reboot
+~~~
+
+Insert Qubes 3.2 USB flash:
+ISOLINUX boot screen should come up.
+Install Qubes normaly
+
+
+If you try to boot Qubes now, it will freeze while  “setting up networking”. You need to put the Broadcom wireless device into PCI passtrough [2,3]. Or, as an alternative remove it from your mac (https://www.ifixit.com/Guide/MacBook+Air+13-Inch+Mid+2011+AirPort-Bluetooth+Card+Replacement/6360) and Qubes will boot up smoothly.
+If you choose to remove the card jump to step 3.
+
+2.	Boot from MacOSX, again.
+~~~
+Run Terminal application as root:
+# diskutil list
+(find your usb device)
+# bless –device /dev/diskX –legacy –setBoot –nextonly  # bless the disk not the partition
+# reboot
+~~~
+
+Insert Qubes 3.2 USB flash:
+ISOLINUX boot screen should come up. 
+Select Troubleshooting and Boot the Rescue image; insert disk password when prompted; select continue and after mounting the HD filesystem, launching a shell, chroot as instructed.
+
+Then:
+a)	Find your Bluetooth card:
+~~~
+# lspci
+..
+02:00.0 Network controller: Broadcom Corporation BCM43224 802.11a/b/g/n (rev 01)
+…
+# qvm-pci -a sys-net 02:00.0 # this assigns the device to sys-net VM
+~~~
+
+then create Create /etc/systemd/system/qubes-pre-netvm.service
+with:
+~~~
+[Unit]
+Description=Netvm fix for Broadcom
+Before=qubes-netvm.service
+
+[Service]
+ExecStart=/bin/sh -c 'echo 02:00.0 > /sys/bus/pci/drivers/pciback/permissive'
+Type=oneshot
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target
+~~~
+And that’s it.
+
+
+3.	After reboot, boot MacOSX, again.
+Run Terminal application as root:
+~~~
+# diskutil list
+(find the HD device where you installed Qubes)
+# bless –device /dev/diskX –legacy –setBoot  # bless the disk not the partition
+# reboot
+~~~
+
+Results:
+•	System booted and running smoothly. 
+•	Youtube video: OK (including full screen after configuration)
+•	Trackpad: OK
+•	Audio control: OK
+•	Brightness control: OK
+•	Keyboard light control:OK
+•	SD card access: OK (tested at dom0)
+•	Lid-close suspend: OK
+•	Wifi: +10%-20% ICMP packet loss when comparing with OSX (have similar rates with tails Linux, more tests are required)
+
+References:
+[1] https://github.com/QubesOS/qubes-issues/issues/794
+[2] https://github.com/QubesOS/qubes-issues/issues/1261
+[3] https://www.qubes-os.org/doc/assigning-devices/