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This guide assumes you do not have a running Raspberry Pi 4 device, and this is your first time opening it up. If that is the case, make sure you follow the steps in this guide first

Once your Operating system is setup and functional you will want to update the firmware to the latest revision, therefore the objective of this guide is to show you how to update Raspian and how to update the eeprom / firmware

Open a terminal
sudo bash
apt update
apt upgrade

Would you like to proceed
Type y
Now reboot your Pi

Open a terminal
sudo bash
rpi-eeprom-update -d -a
reboot your Pi after it updates

Open a terminal
Scroll down and select Option 8 – Update
Update now runs, and after the update completes
Scroll down and select Option 6 – Advanced Options
Then scroll down to Option A7 – Bootloader Options
Select Option E1 Latest – Use the latest version of the boot rom software
Press Enter
Select OK
On the Reset boot rom to defaults screen
Select No
On the Boot rom not reset to defaults screen
Select OK
Scroll down and select Finish
Select Yes

Your Firmware / EEPROM are now Updated, and you will have the latest version with the latest features.

Hardware I used:
Raspberry Pi 4 (4gb)

SanDisk 32GB Ultra microSDHC UHS-I Memory Card with Adapter

CanaKit 3.5A Raspberry Pi 4 Power Supply (USB-C)

CanaKit Raspberry Pi 4 Micro HDMI Cable – 6 Feet

Thanks for reading!