Easun Firmware | Update

: This community is a major hub for discussing specific firmware versions (e.g., SMG II 11kW or ) and recovering bricked units.

Wait 1 to 2 minutes until all internal capacitors drain completely and the display stays completely dark. Turn the inverter switch back .

. Because EASUN inverters are often clones of Voltronic Axpert designs, using the wrong firmware version can brick the device. Power Forum Pre-Update Checklist Identify Version

Identify the in Windows Device Manager under "Ports (COM & LPT)". Prepare for Reflash :

Disable your computer's sleep mode and screensaver to prevent the PC from entering standby during transmission. Step 3: Connect and Isolate the Inverter Turn off the inverter's physical power switch. easun firmware update

Initiate the "Update" or "Reflash" command. The inverter display should indicate that the process is in progress.

: If the tool rejects the file, do not force it. Verify the model version with the seller again. Stuck at 0%

Email official Easun technical support or your direct seller. Provide a photo of your inverter’s specification sticker and your current firmware version.

Remember the golden rules:

: The inverter should be powered by a battery. It is highly recommended to disconnect PV (Solar) and AC Load to prevent power fluctuations during the process. Where to Find Easun Firmware Files

Updating your Easun solar inverter's firmware can resolve critical bugs, improve Maximum Power Point Tracking (MPPT) efficiency, and ensure compatibility for parallel unit configurations. Before beginning, ensure you have the following components:

Before you begin the firmware update process, gather the necessary tools. Inverters, particularly those manufactured by Voltronic Power (which includes many EASUN models), require specific connectivity for flashing.

Completely close any monitoring software, such as WatchPower , to prevent port conflicts. 4. Run the Reflash Tool Open the firmware update software. Select the correct COM port identified earlier. Select the firmware file provided. Click "Update" or "Flash." 5. Monitor the Process : This community is a major hub for

Updates often add support for newer lithium battery profiles (BMS) or improve charging algorithms (Lifepo₄ and Li-ion).

: Use the WatchPower app or scroll through the inverter's LCD menu to identify your current CPU and remote panel firmware versions. Establish Connection :

| Symptom | Likely Cause | Solution | | :--- | :--- | :--- | | "Connection Failed" | Wrong COM port or cable lacks FTDI chip | Check Device Manager. Swap to a known-good RS232 cable. | | "Checksum Error" | Corrupted download file | Re-download the HEX file. Do not use a download manager. | | Inverter beeps continuously after flash | U1 and U2 mismatch | Re-flash the DSP with the correct version. You flashed Axpert firmware on an Easun. | | Black screen, fans running | Bricked bootloader | Hard recovery: Short the "Boot" jumper on the main board (pins 1-2) while powering on, then re-flash within 5 seconds. | | "Fault 21" after update | Bus voltage calibration lost | You need the factory calibration code (Setting 29 or secret menu: UP+DOWN+ENTER for 5 seconds). |