Easun Firmware Update Jun 2026

update using only solar (PV) power, as a passing cloud could cut power and fail the update. Phase 1: Preparation Request Firmware

Click or Browse to select the specific firmware file matching your machine. Step 4: Initiate the Flash

Open the flashing software provided by Easun (run as Administrator if necessary). easun firmware update

Successfully updating your Easun inverter requires a specific set of tools. Gathering everything beforehand is essential to avoid interruptions that could brick your system.

Check if the serial-to-USB driver is installed (often the CH340 or CP210x driver). Update Refused: update using only solar (PV) power, as a

A Windows laptop is typically required to run the reflashing tool. 3. Step-by-Step EASUN Firmware Update Procedure

If the software fails to detect the inverter, check your Windows Device Manager. You may need to download and install the correct USB-to-Serial driver (like CH340 or PL2303) depending on your cable type. Update Refused: A Windows laptop is typically required

Check Windows Device Manager. Change the COM Port number to a lower digit (like COM1 or COM2) in the port advanced properties. Ensure your USB-to-RS232 driver is fully updated. Issue 2: Flash Fails Mid-Way

An Easun firmware update is a powerful way to modernize your solar setup, especially if you are transitioning to smart Lithium batteries. By following the "Serial Number First" rule and ensuring a stable power connection during the flash, you can keep your off-grid system running at peak performance for years to come.

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