Support for firmware-specific issues and hardware revision identification is available on the C3 Picasso Forum
Newer versions of Diagbox are "clone hunters." They check the serial of the interface against a blacklist. If your interface isn't a "Full Chip" version with the correct 440 firmware, it may stop working. This is where the Interface Checker becomes essential for re-flashing. 3. Full Chip vs. Lite psa interface checker 440 link
To prevent your interface from getting "blocked," many users recommend editing the file (found in C:\AWRoot\bin\launcher\ ) to change MAJ_COM=TRUE Check Your Hardware: The Interface Checker is a safer manual alternative
Using the "Check for Updates" feature within Diagbox while connected to the internet can sometimes "kill" clone interfaces by blacklisting their serial numbers. The Interface Checker is a safer manual alternative for firmware management. 0;16; 4.0? 0;16; Serial Number Retrieval
("Full Chip"), which is required for modern vehicles using CAN interfaces and newer versions of Diagbox. Serial Number Retrieval