Dear Alastair,
I do have an European Modell DS-2DE7186-A, which belongs to the PTZ R0-Series.
The current firmware is V5.4.71, I want to go back to 5.2.5. My understanding is, that I can do it in two steps.
First with your BrickfixV2 toll, second with your firmware downgrader 5.3.0 to 5.2.5.
If...