Here is the tip to read Benz MED17.7.3 ECU with Foxflash programmer.
MED17.7.3
Read/write/checksum ok.
Mistake in pinout in foxflash manual use pinout for med17.7.3.1 which use +12 in the left corner not that middle left like in wiring.
To read and write use the following driver:
→ BENCH TRICORE
→ MERCEDES
→ TC1797 – MERCEDES
→ MED17.7.3