The latest Yún shield's firmware should be "v2.0.5"

daef7d526145f6e314ea816cae14de5c *dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin

Model: Dragino v2
Version: Dragino-v2 common-2.0.5
Build Tue Jul 21 20:24:45 CST 2015

Yun Shield Firmware Change Log

If you have early version like this:

Version: Dragino-v2 common-1.3.4
Build Sat Aug  2 17:35:47 CST 2014

It is time to upgrade.

Download firmware image

Upgrading Using the Web Panel

Make sure the Yún shield and your computer are on the same network, and open a browser. Connect to the Yún shield's web panel page by entering the IP address.

Once logged in (default password:dragino), on the first page click upgade, on the upgrade page choose dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin at file system then click Upload buttom. 

Upgrading Using the Command Line:

You can connect to the Yún shield  via SSH and use a command line tool on your computer to upgrade the system's image.

To connect to your Yún via SSH, open the terminal application of your choice, and enter :

ssh root@ipaddress
cd /tmp/
md5sum  /tmp/dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin
daef7d526145f6e314ea816cae14de5c  /tmp/dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin
exec sysupgrade -n "/tmp/dragino2-yun-common-v2.0.5-squashfs-sysupgrade.bin"
Sending TERM to remaining processes ... sleep uhttpd dbus-daemon dnsmasq thd ntpd link_arduino_ww rcS logger syslogd klogd hotplug2 ubusd netifd
Sending KILL to remaining processes ... uhttpd
Switching to ramdisk...
Performing system upgrade...
Unlocking firmware ...

Writing from  to firmware ...  [w]
Upgrade completed
Rebooting system...

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