diff --git a/Firmware-Compatibility.md b/Firmware-Compatibility.md
index 8fc7333..382b8c1 100644
--- a/Firmware-Compatibility.md
+++ b/Firmware-Compatibility.md
@@ -1,6 +1,6 @@
 # Mainboard
 The mainboards with a [STM32F103RCT6](https://github.com/EFeru/hoverboard-firmware-hack-FOC/blob/master/docs/literature/%5B10%5D_STM32F103xC_datasheet.pdf) or a [GD32F103RCT6](https://github.com/EFeru/hoverboard-firmware-hack-FOC/blob/master/docs/literature/%5B11%5D_GD32F103xx-Datasheet-Rev-2.7.pdf) should be supported by this firmware.<br>
-<img src="https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/blob/master/docs/pictures/mainboard_pinout.png" width="700"><br>
+<img src="https://github.com/EmanuelFeru/hoverboard-firmware-hack-FOC/blob/main/docs/pictures/mainboard_pinout.png" width="700"><br>
 For the reverse-engineered schematics of the mainboard, see [20150722_hoverboard_sch.pdf](https://github.com/EFeru/hoverboard-firmware-hack-FOC/blob/master/docs/20150722_hoverboard_sch.pdf).<br>
 
 Some boards have 6 wires on the hall sensors cable, with an additional white wire.<br>