[GUIDE] How to unbrick a totally dead MBL

I tried “diskinternals”.  It shows the drive and partitions but it does not my folders and data. When I double click on the drive which in this case is drive “G” I get this message:

Can’t open disk: NT_Mapped_File G, at the end.  Check disk and try again.

I am not sure where to go from here or what to do

Any help appreciated.