Initial post updated with general directions on how to upgrade the firmware using SSH.
How to upgrade from firmware file using SSH (v4.x)
Connect to My Cloud using SSH.
Change to the Public folder: cd /DataVolume/shares/Public/
Download the firmware file: wget http://download.wdc.com/nas/<name of firmware file>
Extract the firmware file: unzip <name of firmware file>
Issue the firmware upgrade from file command:
/usr/local/sbin/updateFirmwareFromFile.sh /DataVolume/shares/Public/<name of extracted firmware file>
After My Cloud reboots post firmware upgrade one can remove the firmware upgrade files from the Public folder using Windows File Explorer or Macintosh Finder. Or one can issue the following commands from the Public folder using SSH:
rm -f <name of firmware file>
rm -f <name of extracted firmware file>
