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In order for the LPS to work the Crazyflie 2.0 STM32 firmware needs to use the Kalman estimator, which is not included in the stock firmware. You can either download a specific pre-built binary (releases) or by building your own from source.

Building Crazyflie 2.0 STM32 firmware with Kalman

Follow the instructions for installing the toolchain and compiling from the repository readme
Before making the firmware edit the tools/make/config.mk file to include the following:
```
ESTIMATOR = kalman
```
Build the firmware
```
make clean
make
make cload
```

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Building Crazyflie 2.0 STM32 firmware with Kalman

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