This is main (U1) firmware for the Axpert VM II, and probably also the PWM versions thereof (probably called an Axpert VP II or just Axpert VP 3K-24 or similar). This file contains both version 20.13 (2018) and 20.14 (November 2022). It supports 5 kVA, 3 kVA and 1.5 kVA models, all PF0.8 or PF1 (selected by resistors at start-up), except that the 1.5 kVA model is PF0.8 only (1200 W). I can't recall where I found this firmware. Do not use with any other model.
Use at your own risk.
