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FCs might have different versions of firmware (i.e., the software that runs on the FC’s micro-controller) out of the factory. Normally, this only needs to be done once initially. Follow this procedure to update your firmware.

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  colour Yellow title NOTE

  There are currently 2 types of FC hardware. Use the steps corresponding to your hardware. (more details below)

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  colour Blue title FACt

  Our current target firmware is: BTFL 3.3.3 (Download the .hex file below to your base station)

View file
name betaflight_3.3.3_SPRACINGF3.hex

Checking the existing firmware version

On the top left of the CFC interface, please check for the Firmware version. For example, in the figure below, the firmware version of the FC is BTFL 3.3.3.

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colour Red title IMPORTANT

Regardless of the firmware version, if it is the first time setting up the FC, we recommend performing the below flashing procedure once anyways in order to start from a clean state.

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document procedure to flash ACRO version to BTFL 3.3.3

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Flash an FC of the ACRO version

This is what an ACRO version FC looks like. Some key features to notice now are:

• There is a micro USB port soldered on the board

• (In the figure blow, on the bottom right of the board ) There is a “BOOT” button.

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The steps to flash the ACRO version FC is shown in the video below. A short summary is provided here:

1. When connected to the base station, the FC goes in Normal mode

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     there is a red blinking LED

2. Holding the “BOOT” button while connecting the FC to base station makes it go in Bootloader mode.

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     colour Green title check

     there is no red blinking LED. On the ACRO version, there is a solid blue LED

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document procedure to flash OSD version to BTFL 3.3.3

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