Update & change settings on Rasbery Pi bootloader:
==================================================
This works on both rasbery pi os, as well as other Arm32 & Arm64 Linux distros on the rasbery pi 4. Like UBuntu.
This will update the bootloader on eeprom.

-------------------------------------
In install updater:
sudo apt install -y rpi-eeprom

-------------------------------------
File to change updater settings:
sudo nano /etc/default/rpi-eeprom-update

-------------------------------------
To update bootloader:
sudo rpi-eeprom-update

-----------------------------------
Source: https://www.jeffgeerling.com/blog/2019/upgrade-raspberry-pi-4s-firmware-bootloader-better-thermals
Year: 2021