diff --git a/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat
index 98b112de83..859d5e2700 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/OMNIBUSF7V2/hwdef.dat
@@ -31,10 +31,10 @@ FLASH_RESERVE_START_KB 96
 STM32_VDD 330U
 
 # only one I2C bus
-# I2C_ORDER I2C2
+I2C_ORDER I2C2
 
 # order of UARTs (and USB)
-UART_ORDER OTG1 USART1 USART3 USART6
+UART_ORDER OTG1 USART6 USART1 USART3
 
 PA11 OTG_FS_DM OTG1
 PA12 OTG_FS_DP OTG1
@@ -73,8 +73,8 @@ PE5 SPI4_MISO SPI4
 PE6 SPI4_MOSI SPI4
 
 # optional I2C device2, shared with USART3
-#PB10 I2C2_SCL I2C2
-#PB11 I2C2_SDA I2C2
+PB10 I2C2_SCL I2C2
+PB11 I2C2_SDA I2C2
 
 # baro is BMP280 on SPI1
 PA1 BMP280_CS CS
@@ -94,8 +94,8 @@ PA9  USART1_TX USART1
 #PA3 USART2_RX USART2
 
 # USART3
-PB11 USART3_RX USART3
-PB10 USART3_TX USART3
+PD9 USART3_RX USART3
+PD8 USART3_TX USART3
 
 # USART6
 PC7 USART6_RX USART6