This is the most feared outcome. "Bricked" means the inverter becomes completely unresponsive, or only displays Error 32 (which usually indicates a communication loss between the main board and the display).
Locate the silver specification sticker on the side of your inverter. Note down the exact model name (e.g., ISolar SMG II 5K , iSolar SPH 5KW , SMX II 5.6KP ). Find the Current Firmware Version
This is the most challenging and dangerous step. Do not proceed unless you are certain the firmware is intended for your specific inverter model and hardware revision.
Install the correct drivers for your USB-to-Serial adapter. Check Windows Device Manager to confirm which COM Port number (e.g., COM3) has been assigned to your cable. Step 3: Connect the Inverter easun firmware update
Ensure the inverter is connected to a stable battery bank. Never update on PV power alone. 📝 Step-by-Step Update Process Connect the Hardware:
If your laptop does not have a serial port, you must have a reliable USB-to-RS232 adapter.
Monitor the progress bar on your laptop screen. The process typically takes 2 to 7 minutes. This is the most feared outcome
Based on community discussions, users pursue firmware updates for several specific reasons:
Use the official "reflash" tool provided by the supplier or the WatchPower app.
Close all background programs, especially third-party solar monitoring software that might compete for the serial COM port. Note down the exact model name (e
Optimizations in the Maximum Power Point Tracking (MPPT) algorithm can increase daily solar yields.
Power cycle the inverter (off, wait 30 seconds, on). Go into the LCD settings to confirm the firmware version numbers have changed.
EASUN does not host a public, universal download portal for firmware files due to the high risk of users downloading incorrect versions. Contact Official Support
