How to determine firmware version of brick?

My Cloud OS 3 Personal & Network Attached Storage My Cloud
3

You cant modify bootloader from OS (No drivers for SPI flash in kernel, so microchip with bootloader not accessable)

http://community.wd.com/t5/WD-My-Cloud/How-to-unbrick-a-totally-dead-WD-My-Cloud/td-p/631217 (Also my comment on page #4)

Also use Search on forums.