Were having some issues with preboot bundles that were previously working. I cant be 100% sure but it seems to of broke down about the time we updated to ZCM 11.2, or at least thats just when it was reported to me. Imaging is fine in Maintenance mode, but if a bundle is assigned to a machine it gets to the point where it should start imaging and reboots.

Momentarily on the screen is something along the lines of:

Newer software is required please update your PXE files. Error 69

I cant for the life of me see why this would only be happening for an instance launched under z_auto.cfg as opposed to z_maint.cfg.

Any help is greatly appreciated.