If your BMP module is completely 'dead' or shows funny wrong directories the memory and data controller are 'end of life'. Too many modules had to be replaced by a used one or a new module. And these are again of very poor ex works Becker quality.
Recently I got my M054 repaired by an experienced technician in the UK. He replaces memory and datacontroller as long as the small pcb is not broken as result of a 'swelled' battery. You will get your own module really fast 100% working module back including the latest maps installed! Better quality than a new one. Just write him an email: akamil@hotmail.co.uk and tell him your problem. He will answer you if he can repair yours and what the price is. I am for many years on this forum: You can trust Kamil.