> For the complete documentation index, see [llms.txt](https://docs.arkelectron.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.arkelectron.com/products/flight-controller/ark-pi6x-flow/flashing-guide/after-flashing-before-installing.md).

# After Flashing, Before Installing

On the CM4, edit **/boot/config.txt**

On the CM5, edit **/boot/firmware/config.txt**

Comment out the following lines

```
# Automatically load overlays for detected cameras
# camera_auto_detect=1

# Automatically load overlays for detected DSI displays
# display_auto_detect=1
```

Add the following

```
# Turn on uart debug console
enable_uart=1

# General Purpose UART External
dtoverlay=uart3,ctsrts

# Telem2 to FC
dtoverlay=uart4,ctsrts

# Drive FMU_RST_REQ low
gpio=25=op,dl

# Drive USB_OTG_FS_VBUS high to enable FC USB
gpio=27=op,dh

# Drive USB Hub nRESET high. Only on needed on Rev 1.
gpio=26=op,dh

# For pi cam v2, change model for different camera/s
dtoverlay=imx219,cam0
dtoverlay=imx219,cam1

# Fan GPIO
dtoverlay=gpio-fan,gpiopin=19
```


---

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