Changing The Reverse Warning Buzzer To "beeps Once"

Hi - I am aware I am posting about a subject that appears in other forums.

I have a 65 plate Auris Hybrid, Business edition. It is fitted with a rear camera for reversing. When I reverse, it beeps continuously - a distraction and masks other sounds I'd normally use to check that I'm manoeuvring safely.

Has any other new Auris owner successfully had this setting changed ??

The factory setting when reversing is that the reverse warning buzzer "Beeps repeatedly". Referring to the manual "UK AURIS_HV_HB_OM_EE_OM12J68E" states that there are customizable features via either 1) navigation multi-media system, 2) Meter control switches or 3) or by qualified and equipped professional

The manual (p545) states that the "Reverse warning buzzer" can be changed to "Beeps once".

I took the car to my local dealer who use Techstream to connect to the car. The engineer was unable to find any configurable settings (e.g. in the Warnings section) to change the Reverse warning buzzer.

So I left the dealer without having the setting changed.

Any help would be appreciated.

Thanks

Alan