To access it on the new 308:
Automotive forums are buzzing with rumors of hidden “engineer menus,” “test codes,” and “unlocked profiles.” Some of these are useful; others are just cool party tricks. In this comprehensive guide, we will unlock every known secret menu for the Peugeot 308, covering the infotainment system, the instrument cluster, and the climate control unit. peugeot 308 secret menu
Some menus allow you to toggle a "Demo Mode" for the navigation system. Safety First: Words of Caution To access it on the new 308: Automotive
It is recommended that the "Secret Menu" only be accessed for diagnostic purposes (checking software versions or GPS lock) or by authorized personnel. Owners seeking to update firmware or modify configurations should utilize the official diagnostic tools rather than the touchscreen gesture menu to minimize the risk of system failure. Safety First: Words of Caution It is recommended
The exact method to access the secret menu depends on your specific vehicle. Below are the documented procedures from owner forums and technical guides.