I assume that you are aware that Dell markets Snap! servers under the Dell PowerVault name (701N=Snap 2000, 705N=Snap M4100). Here is a link to Dell's documentation for both models:
http://support.jp.dell.com/docs/stor-sys/scobain/en/
The current version of Dell's O/S for these machines is 3.4.790; there is a Dell version of Assist and appropriate .sup files on their site. One thing you may find of interest is that after the O/S is upgraded, attempting to access the server's administration pages results in an error message complaining about the lack of language support. This is rectified by using Assist to also install a matching "help" .sup file, and then the machine works just like any other Snap! (O/S in flash).