"Easun" is often a rebrand of Voltronic Power units (Axpert). Check your sticker for the specific model (e.g., ISolar SMG II, SML III, or IGrid).
: Try a different USB port or a shorter cable. Ensure no other monitoring software (like SolarPower or WatchPower) is running in the background. Do you have a specific EASUN model number particular issue you're trying to fix with this update? easun firmware update
Before updating the firmware: