fremen76

I'd say it is; my guess is that they didn't initialise a Boolean variable to zero. It's a nightmare to check which variables are initialised to what, unless or until I write some code to help decode the C runtime initialisation table.
So you're not supposed to see this setting at all. If you send a QFLAGDd command, it will likely go away. The 'D' is for Disable, and the 'd' is for "Enable/Disable solar feed to grid (reserved feature)" according to a protocol manual. I'm guessing it's not a reserved feature for Infinis. To enable this menu, you are supposed to send a QFLAGEd and also a PFED1 command. PFED is a fairly recent command. Obviously, "FED" stands for grid FEeD.
Edit: As for what the four zeros are about, and what toggles between that format and the GRE/GRD display, it's pretty complex.

Wow, just raw hex files. For the display, you'll have to find the appropriate reflash tool, I believe. Looks like it should be Remote Panel_ReflashTool.exe with 5 DLLs. Let me know if you need help with that.
Thanks for the files.
Edit: Proper VM III (etc) 25.08 display firmware update file is in this post.

These are the firmware U1 56.11 e U2 25.08, the seller told me that to flash it i need to inser a 3k ohm resistor on the TX cable of rs232 (white wire in orignal cable)... today i will record all the data if there are some improvement
VP5K.hex mcu.hex

Yes, like all the other VM III Twin firmwares (56.97, 60.90, 56.09), it works on 6 kW as well as 4  kW models. 55.06 is the latest of these, with VP5K.hex dated 05/Jan/2023.
EDIT: Actually, this file had the wrong date on it; it's actually 4/Oct/2022. So the latest is at present actually 56.97, dated 20/Oct/2022.