You need an (often called the "Peugeot Planet interface"). Verify it has a Rev. C or Full Chip board inside. Cheap Chinese "Rev. B" interfaces will not work reliably with old software.
It is crucial to address the legal and ethical aspects of these discussions. PP2000 and Lexia are proprietary software owned by Stellantis (formerly PSA Peugeot Citroën). PP2000 - LEXIA OLD versions - MHH AUTO - Page 1
PP2000 and Lexia 3, the legacy diagnostic tools for PSA Group vehicles, are specialized, standalone applications designed for deep ECU access. While modern Diagbox versions encapsulate this old software, users often require Windows XP or 32-bit systems for stable operation. For more details, visit French Car Forum . Diagbox for Citroen (and how to get swindled) You need an (often called the "Peugeot Planet interface")