Easun Firmware Update Jun 2026
Provide these photos; their engineers will email you the exact verified ZIP archive containing the safe firmware version for your specific production batch.
Resolution of random error codes, such as unexpected Error 09 (Bus soft start fail) or Error 08 (Motor lock).
Use the original RJ45-to-RS232 or USB cable provided in the box. Avoid low-quality serial-to-USB adapters. 3. How to Squeeze the Correct Firmware from Easun
If you encounter issues during or after the update, stay calm and logical. Most problems stem from connection issues rather than hardware failure. Software Says "Connection Timeout" or "Open COM Port Fail"
Newer firmware versions sometimes remove previously available functions, such as specific grid-discharge timing settings. easun firmware update
Look for DSP_XXXXX.hex or RemotePanel_XXX.bin . A valid file is usually between 80KB and 250KB.
: Contact the EASUN Official Store Help Center with your model number and a photo of your device's nameplate.
Wait 3 to 5 minutes until all internal capacitors drain completely and the screen is completely dead. Reconnect the battery bank.
Most update tools are .exe files designed for Windows. Provide these photos; their engineers will email you
Executing the update requires a direct tether between your Windows PC and the inverter. Step 1: Gather Your Tools Windows-based Laptop or PC. Original communication cable (RJ45-to-USB or RS232-to-USB).
Connect your inverter to your PC using the monitoring software (like SolarPower or WatchPower), check the "Device Information" tab, and note the current firmware display and version number. 3. Sourcing the Correct Firmware Files
Update utilities ( ReflashT_Mcu.exe or InverterUpgradeTool ) are compiled strictly for Windows OS. Ensure the laptop battery is fully charged.
: This community is a major hub for discussing specific firmware versions (e.g., SMG II 11kW or ) and recovering bricked units. Avoid low-quality serial-to-USB adapters
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This often indicates that the main CPU (U1) and secondary CPU (U2) versions are mismatched. Some Easun models require both microcontrollers to be updated concurrently. Request the matching parallel file from support and flash the secondary chip. Critical Safety Tips to Avoid Bricking Your Inverter
Load the firmware file (often named something like inv_app_xxx.hex ). Step 4: The Update Process
Installing the wrong version can brick the inverter. Always double-check the model number (e.g., SMH-II-5KW). 5. Summary Table for Firmware Resources According to EASUN's official help center: Inverter Model Series Suggested Software/Link SMP-5kw / SPS-3kw Go to product viewer dialog for this item. Download Here SML-II/III 3.5/5.5KW / SPL-3/5KW / SMH-3KW / SPH-5KW Download Here SMG-II-3.6KW/5.6KP Go to product viewer dialog for this item. Download Here SMR-II-5.5KW / VE-II-5.5KW Go to product viewer dialog for this item. Use SolarPower Go to product viewer dialog for this item. Use Watchpower
Updates can resolve issues like "Error 08" (bus start failure) or flickering lights caused by unstable AC output logic. Pre-Update Checklist: Read Before Proceeding