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# F401 Blackpill onekey
* Supported Hardware: STM32F401CCU6 WeAct v1.3
To trigger keypress, short together pins *B0* and *A7*.
This variant requires the TinyUF2 bootloader to be installed. This can be downloaded from the [tinyuf2 releases page](https://github.com/adafruit/tinyuf2/releases). The F401 blackpill binary works for both F401- and F411-based blackpill devices.
Double-tap reset to enter bootloader mode. Copy the built uf2 file to the device by dragging the file to the new USB disk.
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