We don't have any Dell devices, but we have seen that or a similar re-enroll type message when students attempt to reset the device. My guess is they have read somewhere that they can reset the device and remove school management and thereby get around filtering and other restrictions that schools put in place.
The only other thing I've seen that sometimes may cause that issue is an extremely dead battery - usually one that has gotten left out in a car in cold temperatures - will sometimes come into us with that type screen message.
We wipe and re-enroll and ask the student to either not bypass our system or not leave it out in the cold (whichever they tell us is the case)
Gerry Mattix-Wand
Director of Educational Technology
East Alton-Wood River H.S. Dist. 14
777 N. Wood River Ave.
Wood River, IL 62095