Casmic1
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The one I posted my mistake (still visible in your quote above) was wasn't 45.13 at all, it was 90.28, which is a valid but old firmware for an Axpert Max 7.2 kW.
45.13 is by far the latest firmware I have for your Axpert Max 7.2 kW '2809.
If you want the "stuck at 90V" issue fixed, then sorry yes, you need a patched firmware, and I'm behind with patching this particular model. So your choices are older patched firmware that might not fix the other issues, or the latest factory firmware that won't fix the stuck at 90 V issue.