This is patched firmware version 156.05, based on main firmware version 56.05 for the Axpert Max II 10kW. It changes only two things (apart from the version number): it fixes the premature float bug, and changes the current at which it switches behaviour from 0.50 A to 0.05 A. The same change is replicated now in MPPT2.
This seems to work; if it turns out that it doesn't, I'll do a full patch set. See this post and those following it for test results of patched firmware version 256.05 (which had only MPPT1 patched).
This firmware is for the TMS320F2809 processor, which is the one with the two voltage regulators (see this post). Do not use with other inverter models.
Original dsp.hex is dated 2022/Mar/16. Hence factory firmware version 56.05 appears to supersede Axpert Max 10kW firmware version 90.01.
Use at your own risk.
What's New in Version 156.05 v2
Released
Updated notes in the .txt file (forgot to save the last edit). Renamed the hex file from ..hex to .hex .