vladsuciu

I will put tomorow the 64.62 150V 0.05A new patched. The 64.62 original is not ok for my 230V panels. 
 
Hi. Now i updgrade my firmware. 
I just rar all on desktop and use reflashtool. Everything is ok. Now i see its 164.62 , only on the display of inverter is still 64.62. 
Thanks coulomb. All the best for you.
 
Edit : in the future if i will put on the other mppt pvs who will have 360-380V it will be a problem if i will stay with 164.62?  Ty

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
 

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