Reason:
When updating the firmware, there must be no interference in the middle (such as unplugging the adapter during the update, etc.), otherwise the BMS will enter the root state, the BMS LED will show a marquee, and the information displayed on the LCD will be 0.
Measure: Wait for the BMS to shut down and update the BMS firmware again to resolve this issue.
This process is also known as a Seplos firmware update procedure, which helps restore the BMS communication function after an interrupted upgrade process.
The detailed tutorial is as follows
Before starting the Seplos BMS firmware upgrade, make sure the RS485 communication connection is stable and the correct firmware file is prepared.
1. Use rs485 adapter to connect to the 485-1 interface of the battery.
2. Directly click on the firmware upgrade page and click Firmware Upgrade.
3. Open the upgrade window:
（1）Choose the correct COM port
（2）Confirm the baud rate is 19200
（3）Open the serial port channel
(If the serial port channel is not opened, the serial port is not opened error will appear)
（4）Select the upgrade file
（5）Confirm upgrade
4. After updating, restarting the BMS/battery will restore it to normal.
FAQs About Seplos BMS Firmware Update
The LED marquee usually appears when the firmware update process is interrupted, such as power disconnection or communication failure during upgrading. Updating the BMS firmware again can restore normal operation.
When the BMS enters an abnormal firmware state, the LCD may show zero values or fail to display information. A complete firmware update through the RS485 interface can solve this issue.
A stable RS485 communication connection is required for firmware upgrading. Users should connect the RS485 adapter correctly and confirm the communication settings before starting the update.
Before updating, prepare the correct firmware file, RS485 adapter, proper communication port settings, and ensure the battery remains powered during the upgrade process.
Avoid disconnecting power, removing communication cables, or interrupting the upgrade process. A stable connection helps prevent the BMS from entering an abnormal firmware state.
Need further assistance with Seplos BMS firmware update, battery communication issues, or technical support? Contact our professional team for detailed guidance and solutions.
