salve. qualcuno ha per caso un firmware per il Axpert MKS III 6kW Twin 63.xx ? io ne ho due con il 63.01 e uno con il 63.02 e spero che ci siano state evoluzioni

Does anyone have VM IV twin 6K frimware ?

While i was performing uploading frimware an issue occur, all the display gone off , is there any possible solution for this ? I thing i upload wrong frimware, if anyone had , please share 🙂

Thanks alot in advance

Does anyone have VM IV twin 6k frimware latest updated . I have read all of the conversations but i only get of VM III twin updates

I was updating with one of the VM III twin frimware but the display gone off totally

Please help me to get the correct frimware for VM IV twin 6K

43 minutes ago, esmail-kassir said:

I have tried from there but it is not supporting display goes blank and it is not showing any error

Help me to get the correct frimware for VM IV twin 6K. For refference i have attach side picture of inverter

new firmware has appeared for vmIII 6kw twin

VM III_TWIN_6813.7z

and MCU wth different number 28.03.

How it is compared with 25.15 ??

Is it safe to upgrade and do not brick the inverter.

Remote Panel_Reflash_MCU(2803).7z

and for vmIV 6 kw twin

VM TWIN_84.03.7z

Edited November 6, 2025Nov 6 by bratpit

On 2025/11/06 at 6:46 PM, bratpit said:

and MCU with different number 28.03.

How it is compared with 25.15 ??

My guess is that 28.xx is display firmware for one of the Voltronics ESS (Energy Storage Systems, i.e. battery modules).

It seems to have many extra and unusual commands, so I'd say for now at least it's not intended or safe to "update" an Axpert display.

Edit February 2026: I didn't have specifically version 28.03 to examine when I said the above. Now that I look at it briefly, it seems to be a perfectly normal VM III (etc) display firmware. It looks like there are other 28.xx that are for the ESS; 28.xx seems to be yet another firmware version number range overlap.

Edited February 16Feb 16 by Coulomb

On 2025/12/08 at 6:19 AM, Coulomb said:

My guess is that 28.xx is display firmware for one of the Voltronics ESS (Energy Storage Systems, i.e. battery modules).

It seems to have many extra and unusual commands, so I'd say for now at least it's not intended or safe to "update" an Axpert display.

I upgraded DSP fw from 60.95 and Inwerter annouced itself like:

I do not upgrade MCU fw because I do not see any VMIII inwerter on voltronic site with rated power 6.2 kW.

So now works , but I needed to do calibration battery voltage -0.7 V.

Fans are quiet .

Testing is goin on.

Edited December 12, 2025Dec 12 by bratpit

15 hours ago, bratpit said:

I upgraded DSP fw from 60.95 and Inverter announced itself like:

Ah, yes. I didn't realise that 68.13 is for 4.2 kW or 6.2 kW. Some resellers seem to get special firmware with an extra 200 W of rated power advertised (I haven't checked to see if it actually would get delivered). This seems to be one of those "special" firmwares.

Alas, there are few other 68.xx firmwares. The other one I have is 68.04, and it's 4.2 kW or 6.0 kW. So perhaps 68.xx is the "special" version of 60.xx.

So you might be better off with 60.10, or possibly 60.87 (older than 60.10, but newer than 60.95, and is another "experimental" firmware version number).

Hi Everyone, first, thanks for the amazing job on this thread.
I'm looking for the newest firmaware for the IV TWIN 4k 24.

I see all the downloads links attached to this thread are unavailable. Does anyone be able to share the latest firmaware and reflash tool?

Really appreciatted.

On 2025/12/13 at 6:47 AM, Coulomb said:

Ah, yes. I didn't realise that 68.13 is for 4.2 kW or 6.2 kW. Some resellers seem to get special firmware with an extra 200 W of rated power advertised (I haven't checked to see if it actually would get delivered). This seems to be one of those "special" firmwares.

Alas, there are few other 68.xx firmwares. The other one I have is 68.04, and it's 4.2 kW or 6.0 kW. So perhaps 68.xx is the "special" version of 60.xx.

So you might be better off with 60.10, or possibly 60.87 (older than 60.10, but newer than 60.95, and is another "experimental" firmware version number).

There are a couple differences between fw 60.95 or 60.10 with this 68.13 FW:

1. MPPT works slightly differently . MPP in 68.13 is achived at higher voltage so there is more power at the same current.This is charts from SA. Temperature outside is nearly the same so conditions is comparable.

   60.95

68.13

I should check it by multimeter for sure

2. In bypass at SBU and Solar only mode 68.13 not charging battery from the grid (was 2.7A in 60.95) but draws 0.7A from battery. It may be positive or negative impact depends what you want to achive.

3. Cooling is about the same at low load but is less agressive at high load so it may be negative impact in places with hot climate. When charging from sun cooling is the same in both fw.

This is chart load+charging from grid 2.5kW . In opposite in 60.95 fan revs goes to max at about 40oC. Here we have 48oC and revs did not go to max.

Edited December 17, 2025Dec 17 by bratpit

Thank you for the new version 68.13 !

Yesterday i put this version in my VM III twin 4k and its work fine, but i think, that the internal measurements of the inverter are in this version very optimistic. I have an offset on the battery charging output of +4A, that means, if no current flows, the axpert shows me 4A. Also the internal measurement of the solarpanel-current are above 150-200V Voltage more than twice as high as in reality. Under this voltage, the display shows the correct value. Badly, it looks like that the internal MPPT uses this wrong values, and the output power is less than it can be. Also, the statistics in dessmonitor shows much to high values.

In december we have short, dark days in germany, so that every watt counts ;-)

My next step was to reinstall the version 60.95 , but by this action my computer gives up and die without any sign of life. I think, that any yovervoltage from the RS232-port from the inverter bricks my computer. The lucki thing was, that i can bring him back to life, with the help of chatgpt.

I bougt an galvanic isolated USB->RS232 interface and installed today the older version 60.95.

I testet also the version 60.87, but in this version are the fans very loud.

Greetings, Peter

Edited December 20, 2025Dec 20 by pintopf

On 2025/12/20 at 5:12 PM, pintopf said:

Thank you for the new version 68.13 !

Yesterday i put this version in my VM III twin 4k and its work fine, but i think, that the internal measurements of the inverter are in this version very optimistic. I have an offset on the battery charging output of +4A, that means, if no current flows, the axpert shows me 4A. Also the internal measurement of the solarpanel-current are above 150-200V Voltage more than twice as high as in reality. Under this voltage, the display shows the correct value. Badly, it looks like that the internal MPPT uses this wrong values, and the output power is less than it can be. Also, the statistics in dessmonitor shows much to high values.

In december we have short, dark days in germany, so that every watt counts ;-)

My next step was to reinstall the version 60.95 , but by this action my computer gives up and die without any sign of life. I think, that any yovervoltage from the RS232-port from the inverter bricks my computer. The lucki thing was, that i can bring him back to life, with the help of chatgpt.

I bougt an galvanic isolated USB->RS232 interface and installed today the older version 60.95.

I testet also the version 60.87, but in this version are the fans very loud.

Greetings, Peter

So We are at the same latitude . Allmost

At mine Twin 6K there is no such excess differences in current . I compared it with what BMS shows but I should it check by multimeter, and when It is 0A axpert shows 0. Panel Voltages at MPP at average shows +8V compared to 60.95.

On 2024/10/24 at 11:32 AM, esmail-kassir said:

Try mine 

it is 60.76 , the best fan logic among all version but for some reason no one want to even try it LOL

I am using it since Aug and everything looks greHellat. 

VM3.hex

hello,
how can I upload this hex file ? in the chat marked as "unavailable"
Thank you in advance for your help

So, what do you advise me to use for my axpert VM III 4KVA TWINS 24V?

And what about this VM TWIN_84.03

Also, what is the best and latest one for axpert VM III 3KVA 24V inverter

🙏🙏🙏

On 2026/01/07 at 6:56 AM, salmoallemi said:

Also, what is the best and latest one for an Axpert VM III 3KVA 24V inverter

That's off topic for this thread, but it's probably version 41.18 from August 2023. Since the higher power models came out, there has not been a lot of change to these inverters' firmware.

On 2024/06/07 at 5:08 PM, Tarek Yag said:

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

Hi, I'm looking for the noise-free version for my TWIN IV 4K (currently on 71.03 / 39.26, in this version the fans are super loud). Can I flash this version onto my unit? Has anyone tried this? Any feedback would be great.
Thanks!!

Edited February 3Feb 3 by Jesus Abril

On 2026/02/03 at 6:15 PM, Jesus Abril said:

currently on 71.03

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.

On 11/09/2025 at 11:39, Maxsteel83 said:

unguento. qualcuno ha per caso un firmware per il Axpert MKS III 6kW Twin 63.xx ? io ne ho due con il 63.01 e uno con il 63.02 e spero che ci siano state evoluzioni

qualcuno sa qualcosa?

On 2026/02/20 at 4:34 AM, Maxsteel83 said:

qualcuno sa qualcosa?

You are more likely to get responses on this forum when posting in English.

Unfortunately, MKS III firmwares are rare for some reason, and I have no 63.xx MKS III firmwares at all.

Your only hope is to get a firmware update from your inverter supplier, unfortunately.

Edit: BTW, the MKS III models are very different from the VM III and VM IV models discussed in this thread. The firmware is literally twice as large for the MKS models, for example.

Edited February 23Feb 23 by Coulomb

On 2026/02/03 at 9:15 AM, Jesus Abril said:

Hi, I'm looking for the noise-free version for my TWIN IV 4K

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.

Edited February 25Feb 25 by pintopf

On 23/02/2026 at 02:54, Coulomb said:

È più probabile che tu riceva risposte su questo forum se scrivi in inglese.

Sfortunatamente, per qualche motivo i firmware MKS III sono rari e non ho alcun firmware MKS III 63.xx.

Purtroppo l'unica speranza è ottenere un aggiornamento del firmware dal fornitore dell'inverter.

Modifica: A proposito, i modelli MKS III sono molto diversi dai modelli VM III e VM IV discussi in questa discussione. Ad esempio, il firmware è letteralmente il doppio delle dimensioni dei modelli MKS.

I just discovered that my 6048mgx-t is not charging. It only draws power from the panels directly. Can you tell me if or why or how to fix it?

On 2025/01/21 at 7:27 AM, Coulomb said:

It looks genuine to me; I've seen that brand before.

I've finally tracked down what causes that CHG LED to misbehave. If you have display firmware version 25.xx, it is expecting the flag that says that float stage is reached in a three-digit field right at the end of the QPIGS command. All three 60.xx firmwares that I've looked at simply don't send this field. It's a wonder that the LED works at all.

So for now, we know that we can't rely on that LED to tell us whether the inverter is in the float stage; this is most unfortunate.

I see your battery voltage flattening out at 54.9 V, which I assumed was your bulk voltage setting, but in fact it's your float voltage setting. Exactly as if the premature float bug was in effect. So I'll have to go back and check my work.

Thanks for being patient and answering all my questions.

Hi

This is quick and dirty fix this issue . Automation in SA. Maybe for premature float bug too.

Edited April 17Apr 17 by bratpit

لو سمحتم. اريد تحديث. جهاز.

موديل :KSIII-3500W-12V