Upon power-up, the firmware checks all hardware subsystems (RAM, flash memory, I/O buses). A corrupt or outdated firmware can lead to boot loops or failure to recognize connected modules.
The ja-8108-w firmware is responsible for several mission-critical tasks: ja-8108-w firmware
Read holding register 0x03E8 (1000 decimal). Value 0x0102 means v1.2, 0x0201 means v2.1. Upon power-up, the firmware checks all hardware subsystems