I have walked this road and it wasn't pleasant or as simple as the documentation suggests. It took approximately 3-4 MX 250 RMA's, waiting on new firmware and bug fixes and about 2-3 years before we were able to successfully swap MX100 with MX250. I think it was in firmware MX15.x that it was mostly sorted and we were able to replace mx100 with mx250 but yeah for us it was painful process. Best of luck
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