Default username and password on a brand new Dell CMC Blade management chassis

The M610 (and all Dell 11G or later servers) has a built in UEFI based utility called the Unified Server Configurator (USC) that you can boot into (by hitting F10 at startup) that includes the ability to download and upgrade the BIOS. There are full instructions on how to use it in this Dell support document. The appropriate OMSA Live CD will do the trick but keeping track of the correct versions for all platforms can be a pain and the USC is the direction Dell intends to go for all hardware management updates in future.

YOu Can find the password on management module interface backside of blade enclosure. remove the IMM module from bay and you can see the password on the top.