From July, 2021, new BACRouter had a hardware revision for improving EMI, but that cause incompatibility with old firmware.
Some users keep using version 2.18, so we provide version 2.19 firmware which is compatible with old hardware and has same features with version 2.18.
Download Firmware version 2.19
From version 4.09, the firmware is compatible with old hardware, but user can not downgrade to prior firmware on new hardware.