Batterys In the fob were replaced. The Chrysler reprogram process was done several times. The Mercedes process was done several times. Locksmith was working on this just to solve it for his own knowledge. He pulled the skreem module. Desoldered the chip to be able to put it in his computer reading unit. Resoldererd the chip in. As far as I know.
im sure he would love to figure this out for his own personal satisfaction. If you’re interested send me a pm and I’ll send you his contact information. I was/am very satisfied with his performance in making me new keys. Pretty cool to have a CNc key cutter in a van!