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FLY-E3 Ultra Bootloader (TF Card) Recovery

For rescue/brick recovery only
  • Please note that the bootloader has already been flashed at the factory, no need to flash it again
  • For normal Klipper firmware updates, please use the TF card process in the firmware compilation page

Entering Burn Mode​

Tip

The right one is the BOOT button, and the left one is the RESET button.

  • There are two ways to enter burn mode.
  • First method: With the mainboard completely powered off, press and hold the BOOT button, then connect one end of a TYPE-C cable with data transmission capability to the mainboard and the other end to your device.
  • Second method: After connecting one end of a TYPE-C cable with data transmission capability to the mainboard and the other end to your device, press and hold the BOOT button, then press the RST button, release the RST button, and finally release the BOOT button.
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Flashing Firmware​

  • TF card Bootloader firmware for E3-Ultra
  • You can obtain the firmware via the following link:
  • The firmware is located at
FLY-Firmware/MainBoard/E3
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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Tip

After flashing is complete, the mainboard needs to be completely powered off once.

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