RNS 510 shows rear parking sensors on the wrong side of the car after failed firmware upgrade

Hello, I've recently purchased a Skoda Octavia Scout mk2 2012 model. I tried to update the firmware of RNS 510 Columbus straight to SW 5274 and it failed. The unit was stuck in upgrade mode and I used a CD containing the latest maps which managed to install and to restart the unit back to normal operation mode. It all seamed fine afterwards until I realized the rear (only the rear) optical parking sensors are displayed on the wrong side of the car when reversing. It senses objects put displays them on the opposite side of the car. Does anyone know how this can be fixed and how it might have happened? (By the way I managed to install successfully afterwards SW 5238 by Josi but it didn't fix the sensors)