The last official map CDs for the Carminat Nav5 (Western Europe 2012/2013) require the v4.61 language layer. If you use an older language disc, the system will eject the new map CD with a "System Incompatible" error.
If you disconnect your Renault’s battery for too long, or if the internal flash memory corrupts, the Nav5 unit sometimes reverts to a "Factory Default" state. That default is often , with no English option available on the hard drive. Renault Carminat Nav5 Language Cd v4.61