Before delving into the firmware specifics, it is essential to understand the hardware associated with this product number.
A: The “B” variant often uses a different microcontroller (e.g., GD32 instead of STM32). Firmware is not interchangeable . Always check the silkscreen. jl381a firmware
If the switch is running a very old version (e.g., PD.01.x branch), it is highly recommended to perform incremental updates to intermediate versions before jumping to the latest PD.02.x release to avoid boot failures. Verification: Before delving into the firmware specifics, it is
#define BAUDRATE 250000
The current firmware for the JL381A belongs to the PD.02.xx branch. Before delving into the firmware specifics
Last updated: October 2025 – this guide will be revised as new jl381a firmware versions are released.