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+2 custom firmware are available for flashing the sideboards that are coming with the hoverboard mainboards.<br>
+Those boards handle:
+* Leds to show battery status for any variant except the transpotter variant
+* Optical sensors that can let you turn on/off some of the features (e.g. [Hovercar variant](https://github.com/EFeru/hoverboard-firmware-hack-FOC/wiki/Variant-HOVERCAR#features) ) 
+* An Inertial Measurement Unit that is meant to be used with the [Hoverboard variant](https://github.com/EFeru/hoverboard-firmware-hack-FOC/wiki/Variant-HOVERBOARD) ( ⚠️ The balancing is not implemented yet ⚠️ )
+
+
+The [GD](https://github.com/EFeru/hoverboard-sideboard-hack-GD) firmware can be used on boards with following chips:
+* GD32F130C6T6
+* GD32F130C8T6
+
+The [STM](https://github.com/EFeru/hoverboard-sideboard-hack-STM) firmware can be used on boards with following chips:
+* STM32F103C8T6
+* GD32F103C8T6
+
+The Digital Motion Processor handles the calculation of Euler Angles and Quaternions, it is only supported on following Inertial Measurement Units:
+* MPU6050
+* MPU6050C
+* MPU6052C
+
+Many sideboards have a different IMU like MPU6050A, which is in fact a ICM-20689.<br>
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