Which image do you have in flash?
Merlin
Merlin is a DreamOS OE 2.5 image, so you should need that kernel module.
I don't know which version of BA you use. I refer to when BA was running in flash, before 12.8.2023, I think. I don't know now how BA works, maybe with a date script.
But trying to install the module should not cause you problems. It is a kernel module that can be downloaded from the original image feeds for your box. I have a dm920, but nothing should change with the dm900 to that end.

