See this post on the Archlinux ARM forum.
RPi5 users should update their bootloader firmware
This will flash your RPi 5 on board EEPROM with the latest updates.
Do this flashing at your own risk.
I have successfully performed this on three RPi 5 and one RPi 500+
The risk is low, but still there especially if your device looses power part way through.
For EnOS, the rpi5-eeprom package is not installed by default.
start by updating your system
sudo pacman -Syu
check to see if rpi5-eeprom is installed
pacman -Q rpi5-eeprom
rpi5-eeprom 20260116-1
If it is not installed
sudo pacman -Syu rpi5-eeprom
Check and see if the latest firmware is installed
su (it is best to do this as root, and not use sudo)
enter root's password
rpi-eeprom-update
It should indicate that Updates are Available.
To update
rpi-eeprom-update -a
You should get something like this.
BOOTLOADER: up to date
CURRENT: Mon Dec 8 07:29:54 PM UTC 2025 (1765222194)
LATEST: Mon Dec 8 07:29:54 PM UTC 2025 (1765222194)
RELEASE: default (/usr/lib/firmware/raspberrypi/bootloader/default)
reboot (important)
Pudge