March 8, 20251 yr This is patched firmware version x63.05, based on factory firmware version 63.05 for the Axpert Max 11kW '2809 non-Twin. Do not use with any other model. The hex file is dated 04/11/2024.This firmware works around the "stuck at 90 V" problem by changing the current threshold from 0.50 A to 0.10 A. It also fixes the premature float bug, and changes the reported version number to x63.05. The internal display will continue to show version U1 63 05.Use at your own risk; I cannot test this firmware as I do not own an Axpert Max. It has been "sanity checked" by disassembling the firmware and confirming that the intended changes are present.263.05 has a minimum MPPT voltage of 200 V.163.05 has a minimum MPPT voltage of 150 V.963.05 has a minimum MPPT voltage of 90 V; use only if you have very low PV voltage (e.g. 4-5 72-cell panels in series). It still has all the other patches, e.g. the lowered current threshold.dsp_original.hex has the factory firmware version 63.05.dsp.hex is the same (when unzipped) as 263.05.To use a different hex file, first delete dsp.hex, then duplicate (copy and paste) the chosen hex file in a file explorer, and finally rename the resultant file to dsp.hex. Unfortunately, this reflash tool only looks for the file dsp.hex. Do this before running the reflash tool.Firmware upload instructions.dsp_x63.05_patched_MaxII_11kW_2809_nonTwin.zip Edited March 8, 20251 yr by Coulomb version → model
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