Why is Germany not able to read data from the Boeing 737 MAX black boxes? It is my understanding that Germany stated it does not have the capacity to read the new software, declining Ethiopia's request: 


  "The French announcement resolved uncertainty over the fate of the two
  recorders after Germany’s BFU said it had declined a request to handle
  them because it could not process the new type of recorder used on the
  737 MAX jets, in service since 2017."


Does anyone know which requirements were missing?
This news article (in German) includes a mention that the black box was using newer software than the BFU has the capability to read out:


  Das Gerät habe eine neue Software, die an der BFU nicht ausgelesen
  werden könne.