I at all,
today has applied this upgrade and seems to be working...
I have a DS3 @ Febrary 2013 with RT6, sensor parking, rear subwoofer and central speaker, and eMyWay navigator...
My previous version are 2.70.E.3, now 2.71.C.1
The applied upgrade is on this page: 121219_1546.ISO
Applied the upgrade in about 5 minutes, during this, the screen show me the citroen logo in background and the progress of the upgrade (upgrading TTS, upgrading BCMs, checking CRC, and so on)
At the start and end, the system reboot with the screen off (at the end of the process, the screen off, I put a bit of fear)
At now I have tested the rear parking sensor, the radio, the USB with iPod, remote control of the radio on sterring, the message for door open during the drive, and the message for seat belt unfastened, the altitude and the current travel road.
It's seems to be working for now.