First of all, install the latest NewNigma2 image for DreamTwo, boot with it. That way it will update the FP/Microcode to the latest one. Then your box will be ready to work with all images, DMM or Open (the 4 available, OpenBH, OpenATV, OpenPLi and PurE2).
Then you can install the OpenBH, OpenATV, PurE2 or OpenPLi, about the freeze at start, this is typical of Amlogic processors/Chipsets, used on this hardware and all Android boxes. But after few seconds it will start working smoothly.
All feedbacks about the Open images are welcomed, as these are "unofficial" images, and we had no support from DMM Engineers about the software or the Open Official Teams, so we built all from scratch ourself (we are a very little team doing them), and naturally these images started to be fine only few weeks ago (December 2020), and need more improvements.
Enjoy the box, that in fact is excellent, but we all need to build the software as we are today's at the early development stages for the DreamOne/Two/Seven boxes.
Emo