Alexyss

hi, i found this, maybe help:
https://www.amosplanet.org/how-to-activate-control-board-of-off-grid-inverter-that-failed-upgrading/#comment-1451

Actually, this is Max II display firmware version 22.20, which was already posted back in December last year.
However, the main firmware 82.06 is great; I didn't have any 82.xx firmware at all before that. Thanks!

Patched firmware versions 264.62 (200 V) and 164.62 (150 V).
I assume you meant an update to the firmware.

You would use the 200 V patch then, version 264.62.

Huh, OK. I'm used to 200 W 72-cell panels; shows how old my system is getting 🙂  And of course how much solar panel technology has progressed.
Having said that, I'd better produce the goods.
This file contains patched firmware version 164.62 for the Axpert Max E 11 kW Twin '2809, but with a LOW MINIMUM MPPT VOLTAGE of 150 V. This will suit owners who happen to have MPPT strings whose nominal total Voc is less than about 250 V. For MOST USERS, they should CONTINUE TO USE VERSION 264.62, which is also contained in the zip file below, but dsp.hex (what the reflash tool will be using) is a copy of version 164.62 (150 V variant) when initially unzipped. So if you think you might want to use the 150 V variant at some point, you might consider grabbing a copy of the below. I have put a readme file into the zip file explaining the various files and what to do to swap between them. Owners with the '28066 DSP chip get the Arena reflash tool, which allows you to pick the firmware file you want by name, saving the tedium of deleting, copying, and renaming with the Windows explorer. But when you have the '2809 processor, as the patches in this post muat be used with, you have to use the old reflash tool that has a fixed file name that it looks for (always named dsp.hex).
The patched firmwares implement all of Georg594's original patches, although one patch (for each MPPT, so two total) could not be exactly applied. I've applied it as best I can "in the spirit" of the original patch. It also fixes the premature float bug, and changes the version number reported by monitoring software to 164.62 or 264.62 as appropriate. The removable display will still show 64.62 (i.e. U1 64 62). The current threshold is changed from 0.50 A to 0.05 A, and the minimum MPPT operating voltage is changed from 90 V to 150 V or 200 V (depending on the variant, 164.62 or 264.62 respectively).
Do not use with any other model, not even the Axpert Max E 11 kW Twin with '28066 DSP chip (but there is a separate patched firmware for that combination). Use at your own risk.
Firmware upload instructions for models with a removable display.
This is file with the two patched firmwares. Without any delete/copy/rename, you can use the reflash tool immediately and it will flash version 164.62 (150 V variant):
dsp_164.62_264.62_patched_150V_200V.zip
 

SMW 11K SN 96342210104495 MAX_11K_TWIN_DSP64.61.rar

Now u can try, u have the old firmware.

Ah, yes, they screwed up the RAR file. The dsp.hex was for the wrong version, presumably 64.08. Fortunately, I was able to perform the final step manually and get the correct 64.62 dsp.hex file.
Please let me know if the attached works, and if it works, if it actually fixes the stuck at 90 V bug. It would be great to have a final, official fix. It looks like it would be easy to apply to other firmware versions as well, as a relatively simple patch.
[ Edit Oct 2023: It doesn't seem to be the genuine fix we were hoping for. ]
64.62＿ISOLAR SMW 11KW TWIN recovered.zip

The firmware update file for 64.08 is available, so a patched version is possible. There are so many models and so many firmwares.
Plus, it's still not totally clear to me what the best fix is. My slight favourite is replacing the 5.0 A current threshold (which we thought for a while was a 0.5 A) with 0.5 A. [ Edit: I'm back to believing that the threshold is 0.50 A, and the best patch reduces that to 0.05 A). ]
It's also possible that recent changes by Voltronic to at least two recent firmwares have fixed this problem, but I haven't seen any indications that they have.
I'm happy to do the patch if I can find the time and if there is enough call for it.
Anyone else looking for an MPPT fix for the Axpert Max E 11 kW '2809 Twin? 

Google translation of the above:
The attached firmware referred to contains main firmware version 64.07 and display firmware version 38.06. Neither of these is the very latest, and I'm 99.5% sure that neither 64.07 or 64.08 have the "new" Voltronic code. So the MPPT bug remains, unless there is an even newer firmware that we haven't seen.

Hi, i will get correct firmware for this inverter: DSP and MCU, tested on easun 11kw TWIN, communication  with battery work
11kw.zip