I too have a WZR-600DHP and the upgrade failed.
I am currently at DD-WRT v24SP2-MULTI (11/04/12) std - build 20180
I want the security fixes in the latest.
but as soon as I initiate the Upgrade is reports Upgrade Failed.
How do we get these security updates
?
oldunixguy
UPDATE
I was successful by modifying the file name. I am now running the 30356 update!
oldunixguy