Iecutool.com here shows an example of using the Foxflash and OTB adapter to read a Mercedes Crd3 ecu using obd driver.
This is the CRD3.20 ECU
What’s needed:
Foxflash
OTB Adapter
Power supply
OBD Cable
Mercedes Benz CRD3.20 pinout
Identify needed OTB connection
Prepare some cable connections
Connect to foxflash OTB adapter
Connect to ECU CRD3.20
Now connect OBD cable to OTB adapter and add 12v power
Connect OBD cable to OTB adapter
In foxflash car obd, select Mercedes then C calss, then CRD3.x
We will use the fast canbus driver
Get ID
Read flash
Select the file to write
Write flash until finished.
Video reference: