These notes are from a D350 Defender in the UK:

Pivi Pro 4.3.1
OS Release 4.3.1

Direct to your Defender: new software update available now.

This includes
– Sunroof status within InControl Remote app optimizations (Applicable vehicles)
– Adjustment to support mobile network 3G sunset
– Enhancements to diagnostics
– Improvements to the telematic backup power system.

Audio quality improvements which resolves
– Rear Traffic Alert may be inaudible in some instances.
– Sound may be played through the incorrect audio channel on Meridian Sound System.

This update also brings bug fixes and general performance advancements to the following systems where applicable
– Propulsion systems
– Vehicle communication network

PHEV only: Please note that for a short period of time, you may experience some disruption in the EV capabilities after the update has completed. Please disconnect the vehicle charger and ensure the battery has a minimum charge level of 25% before starting the update.