--- title: LS423 Theory of Operation slug: hardware/ls423-theory-of-operation docTags: createdAt: 2025-03-11T07:10:52.796Z --- This section describes how specific components operate on the LS423. # On-Board LEDs The LS423 has a single **red** LED to indicate that the power is on. The LED will flash during the firmware update process. It will also flash a certain number of times to indicate an error state. The flash codes are described below: | **Flash code** | **Description** | | -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | 2 | Unspecified error | | 3 | Network recovery script is preparing to run on a device configured for network recovery. | | 4 | No upgrade file found. | | 5 | Failed to load kernel module. | | 6 | Board is not capable of running the current firmware version. | | 7 | A piece of on-board hardware is not working correctly. | | 8 | Problem related to the storage device (either the USB drive or microSD card) | | 9 | Problem related to the registry/NAND | | 10 | The autorun script encountered a load/run error. | | 11 | WiFi-related error | | 12 | Unable to find a bootable image. | | 13 | The root file system has failed verification, which is used to detect whether the file system has been tampered with. You can recover a player that is showing this error code by performing a firmware update with secure boot. | | 14 | Boot loader failure | # On-Board Switch The on-board switch is connected to a GPIO12 pin that is pulled low when the service (SVC) button is pressed. Conversely, a pull-up on the button normally sets the GPIO12 pin to be pulled high. # Reset Switch / GPIO Button The on-board switch is connected to the reset circuit. Pressing down the reset button will send an initial signal to the system software, and holding the reset button low for approximately 4 seconds will cause a hard reset. # microSD Slot The LS423 has one microSD slot, which supports transfer modes up to UHS-1 DDR50 (50MB/s). There is no inherent limit on the storage capacity of microSD cards used with the player. # Wireless Module The LS423 has an internal M.2 slot for installing a compatible wireless module. The M.2 wireless module connects via cable to an external, attachable wireless antenna.