This is main (DSP, U1) firmware version 90.14 for the Axpert Max I 8kW (with removable display, not the Axpert Max II with the fixed colour display). So not use with other inverter models or models with other rated power (e.g. 7.2 kW or 11 kW), but be aware that the Axpert Max 8kW is sold with various names by various resellers. dsp.hex has the date 18/July/2022. Use at your own risk.
If you attempted to reflash your 8 kW MAX I with firmware version 91.04, then unfortunately the software in this file will not work. In that specific case, use the 90.14 recovery download instead.