--- title: XTx43 Theory of Operation slug: hardware/xtx43-theory-of-operation docTags: createdAt: 2025-03-11T07:10:52.796Z --- This section describes how specific components operate on the XT243 and XT1143. # On-Board LEDs There are four on-board LEDs that indicate the following: | **LED** | **Indication** | | ------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | Green power (**Pwr**) | Displays when the board is powered up and not in reset mode. Flashes during the firmware update process. | | Green file-system activity (**Bsy**) | Flashes any time there is file-system activity (on any storage device) | | Blue WiFi (**WiFi icon**) | Flashes when the player is connecting to the wireless network. Displays when connected. | | Red status (**Err**) | Flashes a certain number of times to indicate which error is occurring. The flash codes are described below. | | | 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 | | Red alternate | The red status LED may give one long initial flash to preface an alternate code, described below: | | | 2: Erase failed | | | 3: Write failed | | | 4: Verify failed | | | 5: Failed to find UBI partition | | | 6: Attempt to write unsigned CFE to unit with secure boot enabled | | | 7: Failed to find UBI partition | | | 8: Failed to create/attach UBI partition | | | 9: Unexpected error | | | 10: Upgrade script exited abnormally | | | 11: Upgrade took longer than expected | | | 12: Update completed but update file could not be deleted | | | 13: Firmware update file could not be read (from firmware v5.1.40) | # On-Board Switch The on-board switch is connected to the GPIO12, which is pulled low when the service (SVC) button is pressed. Conversely, a pull-up on the button normally sets the GPIO12 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 XT243 and XT1143 have 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 XT243 and XT1143 have an internal M.2 slot for installing a compatible wireless module. The M.2 wireless module connects via cables to two external, attachable wireless antennas. # SSD Module The XT243 and XT1143 have an internal M-keyed M.2 slot for ATAPI SSD drives. See [this page](docId\:aEdGJ5B7OAO861a-oN62-) for all SSD specifications.