I have a Yun shield that is the Iduino Yun WiFi shield. It has a USB port and a LAN port. It is running the Linino from Jan 6, 2015. I'm pretty new, so I am unsure if your recommendations to update the Yun to version 1.5.3 apply to the yun shield as well, or just the arduino yun. The shield connects to an Arduino Uno, which I have a V3 connected to it. The Uno has a power plug attached and supplies power through the shield pins to the Yun. The information on the site says that the shield talks to the Uno through the UART.
web site here:
http://www.geeetech.com/wiki/index.php/Iduino_Yun_Shield
I dont want to mess up the Uno under it, or the shield itself. Can someone confirm for me if the shield follows the same process as the arduino yun upgrade process and if I should execute the upgrade process on the shield.