Thanks for the ideas, Boris. The main problem is that the edge does not even start (it gets in the boot screen forever!), so I could not try anything from "inside" the OS (that includes seeing the memory stick content! If I was able to start, I would definitely restore all the initial configurations, but I couldn't do it).

At first it's weird because I always used this stick to transfer files from my mac to the edge but it makes sense that, although accepted by the android system, it is not recognized by the MS-DOS boot, that is very low level.

update: Dingo back!!!