Victron VE.Bus Configuration Guide

Table Of Contents
If the firmware update fails, please attempt it again. If you still cannot recover the unit, Please use the alternative method
and follow these steps using the VEFlash software instead.
11.4. Firmware updates with multiple units (eg 3 phase)
It is possible to use VictronConnect to efficiently update the firmware for 3 phase, or parallel units.
To do this, the units must already be programmed for their multiple unit configuration and connected to each other.
Units will be returned to factory default settings once the firmware update is complete. So make sure that settings and parameters
are saved, and you will also need to reprogram them for their multiple unit configuration (as is covered in the 3 phase and parallel
documentation).
https://player.vimeo.com/video/373208468
VictronConnect - VE.Bus Configuration guide
Page 21 Firmware Updates