ChemistTR

I can confirm that the fault code 90 function is still present in the firmware, but it is no longer called. It is still called in 57.05 and 57.60.
I wonder if this is an official firmware? But I have seen a few others without fault code 90 being active, so maybe Voltronic have finally stopped trying to fight the clone makers.
The label above looks legitimate to me. I wonder why that inverter lost its serial number. [ Edit: Oops, I've just realised that it's the same photo as before, with the same serial number. ]
The below is factory firmware version 57.07 for the Axpert Max E 11 kW non-twin for the '2809 chipset. Do not attempt to use it with any other model, and use at your own risk.
MAXE11K_CNTL_DSP_5707.rar

Uh oh, not good. This is what happens when clone manufacturers steal genuine Voltronic firmware, and they don't copy the environment perfectly; fault code 90 turns up after 60 days of run-time.
Unfortunately, updating the firmware won't fix the problem.
If one of your inverters (the one with the serial number 5535553555...) is a clone, you will need your clone supplier to provide their own, or at least a patched firmware. But some clones are so basic that they can't be updated at all. In that case, there is nothing much that can be done. Perhaps reverting to all default settings via command or monitoring software, then re-doing your settings, will give you another 60 days, then you have to do it all again.
If your machines are all genuine, and the sticker in the photo looks genuine to me, then that inverter has lost some EEPROM values. But I note that the serial number under the barcode matches the middle inverter on your monitoring software.
To restore them and clear fault code 90, you need a setserial program from your non-clone supplier. Each setserial program is unique to a particular serial number, and is cryptographically hard to generate unless you are Voltronic. You can't talk directly to Voltronic, you have to talk via your supplier, who will verify your ownership, and will consult with Voltronic on your behalf. 
Perhaps post the sticker for the first inverter, the one that is showing serial number 5535553... I can usually tell if it's a clone or not.