With the Raspberry Pi connected to the Fysetc Spider via USB and the Spider with 24v, power on the RPI.

You can find the IP address of the Pi by looking at the connected client list in your router or by opening cmd.exe on your PC and running

You can also find the IP by using the Adafruit Pi Finder App

If you changed your hostname in the Advanced Settings when you imaged the USB/SD card you need to try to ping that hostname. ping YOURHOSTNAME -4

In a webpage enter http://YOURHOSTNAME or your printers IP address

Ignore the Klippy error

Navigate to the Machine tab on the left.

Select Upgrade to update the RPI image and Update to install updates for Klipper, Mainsail and Moonraker. Once the updates are complete reboot the RPI