Sliva

So finally I managed to upload the firmware... A successful upload was made using a 4-wire serial cable, connected as shown in this tutorial (https://youtu.be/6F5HPOZJapI?si=UaCU8iVJOkT1-UN3) using an older laptop with a serial port. I didn't have a resistor on the cable. At first I was unable to establish a connection via the serial line, but I was able to start uploading via USB to Micro USB cable quite easily. Originally, I turned on the inverter by connecting the battery. Subsequently, I switched to switching on by connecting the grid (the battery was disconnected). And now perhaps the most important trick - procedure: 1) Connect the notebook with 2 cables, a serial line and a USB to micro USB cable - leave both cables connected at the same time. 2) Start the inverter so that the PC can see the USB device. 3) Run the upgrade utility, set the upgrade via usb. 4) Start the updating and wait until it ends with an error, but we don't mind, the circle around the display will flash red. 5) Do not close the utility, but switch it to the appropriate COM port where the serial cable is connected. 6) Turn off the inverter, the inverter goes silent but the display still flashes red. 7) Turn on the inverter and within 2 or 3 seconds start the upload via the COM port. At this point, the display was already booted up and could immediately receive commands from the serial line. As soon as the recording over the serial line started, everything came well to end and the inverter woke up with the new firmware. Tomorrow I will test how it handles all-day fog and whether the 90V bug is really removed. So hopefully this procedure will also help someone. I don't know if this procedure ensured the connection via the COM port or if it was just luck with the timing... Anyway, I don't want to try it again Anyway, I can confirm that the firmware works on the inverter with the original version dsp 82.01 and 122.12. now I have 82.63 + 122.12 Sliva.

Hmm, thank you for fast response. First i will try modify serial cable, but until now I was not able to start upload over serial cable. But I have only 3 wire cable, and cable described in this thread have 4 wires plus resitor, so I will fisrt try modify my cable. Maybe it will help. I am trying this with old computer with HW serial port without RS-232 adapter. Display is "working" so next step will be OTG usb cable + usb flash, maybe it offer start of update... I will report progress here. Thank you for now.

Hi coulomb, I have an inverter Axpert max II 10kW (yellow box from SP24), Main version 81.01, secondary version 122.12 and according to everything I read here this firmware (82.63 from rar file from cited post) should be compatible. So I tried uploading it using a USB to micro USB cable. Everything went without a problem until the 13th percent where the flash tool got stuck and did not continue. After restarting of the inverter, the display says error 32. I manage to start the firmware upload again by reconnecting the battery and starting the inverter at a right time. The upload starts, but never finish well. The furthest I got was 16% when I reduced the programming speed in the ini file of the flash tool. I tried different PCs and cables. Nothing helped. I just note that the uloading stops after a different amount of data, it depens on used PC and cable. Can you give me some advice or tip what could cause this problem, what should I try next to upload FW ? Thank You.