One of our customers has managed to read Mercedes Delphi CRD3.10 ECU with Xhorse Multi Prog.
Select MB Delphi CRD3x.x TC1797 protocol.
Boot is a different pinout. If your ECU is on service mode you need read in boot mode.
Pay attention to 2 resistors. 2x 1k resistor.
Multi prog will show you wiring diagram.