Jesus Abril

I think, a noise-free version doesnt exist,because a minimal air convection must exist.
In my VMIII Twin - 400W works with DSP Firmware Version 60.95 and Display 25.12.
In this 60.95 version are the fans are controlled by temperature and under less output power the fans produce less noise.
I think, this version is a good compromise between cooling and noise.

All I can tell you is that 71.03 is the only 71.xx file for VM III/IV Twin in my collection. So the safest path of updating to a later 71.xx is not available to you.
So unless you can get a suitable update from your inverter supplier, you'll have to try one of the other VM III/IV firmwares from this topic, and hope that it doesn't brick your inverter or damage it, and pick one that a reader says is quieter.
Hopefully, if all else fails, you can revert back to 71.03 from here. But there are no guarantees, unfortunately.
If I had time, and I currently don't because of a family issue, I might be able to figure out what the quiet firmwares do, and back patch it to 71.03. But that's also a lot of work.

Here is another HEX File Only Package of (DSP / Main CPU / U1) firmware for VM III TWIN and VM IV TWIN.
An updated list of available packages in this thread can be found in the very first post at:
https://powerforum.co.za/topic/29708-collection-of-dsp-axpert-firmware-for-vm-iii-twin-and-vm-iv-twin/
CREDITS: Original uploader of the attached firmware file:
@AMalakani DSP version 70.00 dated 2023/06/28
Note: Quiet fans control logic got introduced in this version + I copied this firmware's full package from the uploader's post at the AEVA Forums
Link to original package post
USE AT YOUR OWN RISK, NO GUARANTEES WHATSOEVER!
DSP Reflash Tool is always available in the very first post of this thread at:
https://powerforum.co.za/topic/29708-collection-of-dsp-axpert-firmware-for-vm-iii-twin-and-vm-iv-twin/
Detailed instructions of how to update/reflash firmware of Removable and Round Display inverter models, posted by @Coulomb at:
https://forums.aeva.asn.au/viewtopic.php?p=87767#p87767
If you think your inverter is bricked, there are a number of helpful tips posted by @Coulomb at:
https://forums.aeva.asn.au/viewtopic.php?p=59897#p59897
Enjoy!
VM TWIN (III & IV) DSP 70.00 hex.zip