Foxflash will read and write PSA EDC17C60 on bench mode. Always have 13v+ on this type of ecu while writing. On some it works bench but others who have the update with code that blocks writing (see image below).
In this case, we can write in boot mode.
Read password in boot mode then change the pinout as per the procedure indicated and you can write.
Example: Edc17c60 Peugeot read code after we can write boot
Read also:
http://www.pcmtuner.org/foxflash-read-and-write-citroen-c4-edc17c60-on-bench/