Might as well post the following firmware links to this thread. Somewhere someone wanted links to past firmware but cannot find that thread in a search. In rolling back the firmware to find one that will work with my external 1T USB drives I wound up compiling the following firmware link list from various other threads. Obviously some firmware versions are missing.
Firmware Release 04.04.03-113: http://download.wdc.com/nas/sq-040403-113-20160510.zip
Firmware Release 04.04.02-105: http://download.wdc.com/nas/sq-040402-105-20160111.zip
Firmware Version 04.04.01-112: http://download.wdc.com/nas/sq-040401-112-20151013.deb.zip
Firmware Version 04.04.00-308: http://download.wdc.com/nas/sq-040400-308-20150924.deb.zip
Firmware Version 04.04.00-307: http://download.wdc.com/nas/sq-040400-307-20150921.deb
Firmware Version 04.04.00-303: http://download.wdc.com/nas/sq-040400-303-20150902.deb.zip
Firmware Version 04.01.04-422: http://download.wdc.com/nas/sq-040104-422-20150423.deb.zip
Firmware Version 04.01.03-421: http://download.wdc.com/nas/sq-040103-421-20150217.deb.zip
Firmware Version 04.01.02-417: http://download.wdc.com/nas/sq-040102-417-20141211.deb.zip
Firmware Version 04.01.01-413: http://download.wdc.com/nas/sq-040101-413-20141106.deb.zip
Firmware Version 04.01.00-408: http://download.wdc.com/nas/sq-040100-408-20141010.deb.zip
Firmware Version 04.00.01-623: http://download.wdc.com/nas/sq-040001-623-20140904.deb.zip
Firmware Version 04.00.00-607: http://download.wdc.com/nas/sq-040000-607-20140630.deb.zip
Firmware Version 03.04.01-230: http://download.wdc.com/nas/sq-030401-230-20140415.deb.zip
Firmware Version 03.04.01-219: http://download.wdc.com/nas/sq-030401-219-20140218.zip
Firmware Version 03.03.02-165: http://download.wdc.com/nas/WDMyCloud-030302-165.zip
Firmware Version 03.03.01-156: http://download.wdc.com/nas/WDMyCloud-030301-156.zip
Firmware Version 03.01.04-139: http://download.wdc.com/nas/WDMyCloud-030104-139-20131028.zip
Firmware Version 03.01.03-127:
Firmware Version 03.01.02-125:
Firmware Version 03.00.03-413 – Initial Release:
One can view the entire release history in the current firmware readme file: http://support.wdc.com/download/notes/WD_My_Cloud_Firmware_Release_Notes_04.04.02-105.pdf
Post updated with new links