There have been some reported incidents where the Surface Pro Image can't be captured or leaves the Surface Pro inoperable.
For best results, ensure you are on 7.5 SP1 or higher.
These are the known steps to capture Surface Pro images successfully:
Note! The time to PXE boot a Surface Pro is significantly longer than a machine with a dedicated NIC. This is likely due to the difference in performance of a dedicated network card compared to the USB dongle. For further information, contact the hardware manufacturer.
Deployment Solution 7.5 all versions.
Deployment Solution 7.6 all versions.
Deployment Solution 8.x all versions.
Microsoft Surface Pro 3 tablets.
Microsoft Surface Pro 4 tablets.