Use this if the inverter is offline or a specific version is required.
Use the Batch Upgrade feature if you have multiple devices Device Upgrade. Troubleshooting Firmware Update Issues
As of early 2026, the primary firmware series for the M1 inverter range (3KTL to 10KTL) is the branch.
A: Do not power off. The inverter will often retry. If it fails three times, use the USB recovery method. If the LCD is frozen, cut AC+DC power for 5 minutes to hard reset.
Modern firmware updates for the SUN2000-6KTL-M1 focus on several key areas:
You can update the inverter's firmware using a mobile device with the FusionSolar app or the SUN2000 app. Download the Package Access the Huawei Digital Power Support Portal to download the latest firmware package (often in
Historically, Huawei firmware updates were accessible via the FusionSolar app or extracted from SD card updates found on regional Huawei support sites (often the Australian or Polish portals were gold mines). However, in recent years, Huawei has tightened the screws.
Dynamic voltage tracking across dual independent MPPTs (140V to 980V range).
Native three-phase output balancing and variable power factor correction.
A specific bug observed in early M1 firmware revolved around the "PV Power" reading during low-light conditions.
[FusionSolar Web Platform] ➔ [Plants] ➔ [Upgrade Management] ➔ [Create Update Task]
Upgrading firmware is usually safe, but complications can arise if the connection drops.
