Using the -Bless Command on Multiboot Macs with 10.11 El Capitan
I've had good luck using AutoDMG and munki's crgateosxintallpkg scripts with 10.11 in beta. I haven't done the work yet on the current build, but i think these SIP issues and bless changes were fit in by Apple before release so you shouldn't have issues using these tools.

Are you running into a specific error? What MDM or deployment framework are you using? If you have scripts, it might be easier to adopt one of the standard tools than re-working yours, but both are on github so you can see how they are handling SIP/bless if you need that level of detail.


https://github.com/MagerValp/AutoDMG
https://github.com/munki/createOSXinstallPkg
Automate Yosemite Upgrade
https://jamfnation.jamfsoftware.com/article.html?id=334
https://support.apple.com/en-us/HT205054


The last link is Apple's official word on how you will need to script your client Mac to trust the netboot server and the commands needed to navigate the SIP changes for distribution of 10.11 images.

In a nutshell, you can list the "blessed" netboot servers as opposed to blessing the image itself.

csrutil netboot add 10.0.10.10
csrutil netboot list