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FLY-LLL Flux Buffer Firmware Flashing

Applicable Versions

This page applies to devices with firmware versions lower than v2.0.0. For v2.0.0 and above, you can update directly through the web tool without entering DFU. Please refer to Firmware Update.

Check Firmware Version​

After connecting the device via the FLY-LLL Flux Buffer Configuration Tool, you can view the current firmware version in "Device Information".

Enter DFU Flash Mode​

Power Off First

Before starting, completely turn off the printer and disconnect power from the control board. Do not plug or unplug the Type-C data cable, manage wiring, or touch terminals while powered on.

The control board is located on the buffer assembly. Refer to the silkscreen on the board for the Type-C port and button locations. You can enter DFU using either of the following methods:

  • Method 1:

    1. Connect the control board to the computer using a Type-C data cable that supports data transfer.
    2. Press and hold the BOOT button on the board (silkscreened as BOOT0 on some batches), then briefly press RESET (NRST).
    3. Release RESET first, then release BOOT.

  • Method 2:

    1. Press and hold BOOT first.
    2. Connect the Type-C data cable between the control board and the computer. Release BOOT once the computer recognizes the device.
Button Identification

The channel buttons on the control board cannot substitute for BOOT / RESET. Please operate only after confirming the silkscreen labels. If DFU still cannot be recognized after multiple attempts, power off first and check the data cable and buttons.

After entering DFU, 0483:df11 should appear in lsusb on the computer. If it does not appear, please repeat the entry steps above.

Flash Firmware​

Please download the complete firmware with Bootloader:

Power-off operation

Before connecting or reconnecting the USB cable, completely turn off the printer and disconnect all other power supplies. Do not let the tool board be powered simultaneously through the printer power supply and the USB interface.

USB connection compatibility

The USB interfaces on some computers may cause unstable flashing due to driver or signal compatibility issues. If the connection fails, try using a different USB interface on the computer or use a reliable-quality USB dock; when the error shown below appears, also check the USB connection and driver first.

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  1. Download and install SetupSTM32CubeProgrammer and the STM32 DFU driver from the auxiliary software download page.
  2. Save the firmware downloaded on this page to a location on your computer that is easy to find.
Windows file extension display

Windows may hide file extensions. In File Explorer, check "File name extensions" to confirm that the firmware is still .bin or .hex, and do not change the file extension.

  1. Confirm that the device has entered DFU flashing mode according to the product tutorial, then connect it to the computer using a USB cable that supports data transfer.
  2. Open STM32CubeProgrammer, select USB mode, refresh the device list, and connect.
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  1. If no error pop-up appears, the connection is successful.
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  1. Click the download icon on the left, and check the flashing options as shown in the figure below.
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  1. Click Browse and select the firmware to be flashed.
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  1. When flashing .bin firmware, set Start address to 0x08000000; when using .hex firmware, keep the address included in the file.
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  1. Click Start automatic mode to begin flashing.
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  1. When the success prompt appears, the firmware flashing is complete.
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Do Not Select the Wrong Firmware

DFU flashing must use the complete firmware in the mergedBL directory. The application firmware in Product-Firmware does not include the Bootloader and cannot be used for DFU flashing on this page.

Note

Do not disconnect the Type-C connection or operate the control board buttons during flashing, otherwise flashing may fail.

Next Steps​

After flashing is complete, the device will restart and gain web update capability. When upgrading the main firmware later, simply refer to Firmware Update; there is no need to enter DFU again.

If the device still fails to start after DFU flashing is complete, power off and power on again first, then check whether the Type-C data cable, BOOT / RESET operation, and firmware file match.

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