Easun Firmware Update [portable] -
Updating the firmware on an EASun inverter can solve specific technical issues and unlock better performance, but it should only be done if you are facing a known problem. Key Benefits & Fixes
Finding the exact firmware can be challenging as it varies by specific hardware versions. easun firmware update
Part 10: Maintaining Your Inverter Post-Update
Once you have successfully completed the Easun firmware update, your work is not done. Updating the firmware on an EASun inverter can
interrupt the power or disconnect the cable during this time, as it will damage the device's bootloader. Power Forum Troubleshooting & Tips Easun SMW 11KW #72 - syssi/esphome-smg-ii - GitHub Do not use Voltronic Power firmware (Axpert, MPP Solar)
Important Final Notes
- Do not use Voltronic Power firmware (Axpert, MPP Solar). Even though EASUN clones Voltronic hardware, using official Voltronic firmware often bricks the unit due to different LCD drivers and component values.
- If the inverter becomes completely unresponsive (black screen, no beep), you need a bootloader recovery via a special programmer (e.g., TL866 or JTAG). This is advanced repair – consider returning the unit or contacting EASUN for a replacement mainboard.
- Keep a copy of your original working firmware if you can extract it. EASUN rarely publishes rollback files.
- Verify your internal board says
Axpert MKS III Compatible. - Download
Axpert_Reflash_V90.06from a trusted source. - Use the
USB to TTLmethod (3.3V logic), not RS232. - Do not update the secondary CPU (U2)—that is screen-specific. Only flash the DSP.
Monitor Progress: The inverter display will often go dark or show an "UP" status during the 5–15 minute process. Do not disconnect cables until a "Successful" message appears. 3. Known Risks & Issues Issue Description Bricked Inverters
1. Solving Known Bugs
Many Easun models (SMW, MPS, iSolar, and PowerPlus series) ship with early firmware that contains bugs: