If you are referring to the EEPROM boot loader, it shouldn’t matter with a uSD card, but must be the latest version for USB SSD.
Since you have Manjaro working, you can check the version of the EEPROM bootloader with
You may have to install this package “rpi-eeprom” and hopefully Manjaro will have it.
sudo rpi-eeprom-update
*** UPDATE AVAILABLE ***
BOOTLOADER: update available
CURRENT: Tue Jan 25 02:30:41 PM UTC 2022 (1643121041)
LATEST: Tue Apr 26 10:24:28 AM UTC 2022 (1650968668)
RELEASE: critical (/lib/firmware/raspberrypi/bootloader/critical)
VL805_FW: Using bootloader EEPROM
VL805: up to date
CURRENT: 000138a1
LATEST: 000138a1
Surprisingly, I have an update on the BOOTLOADER.
I believe the section VL805 has something to do with the onboard USB chips?
To update the EEPROM bootloader
sudo rpi-eeprom-update -a
*** INSTALLING EEPROM UPDATES ***
BOOTLOADER: update available
CURRENT: Tue Jan 25 02:30:41 PM UTC 2022 (1643121041)
LATEST: Tue Apr 26 10:24:28 AM UTC 2022 (1650968668)
RELEASE: critical (/lib/firmware/raspberrypi/bootloader/critical)
VL805_FW: Using bootloader EEPROM
VL805: up to date
CURRENT: 000138a1
LATEST: 000138a1
CURRENT: Tue Jan 25 02:30:41 PM UTC 2022 (1643121041)
UPDATE: Tue Apr 26 10:24:28 AM UTC 2022 (1650968668)
BOOTFS: /boot
Using recovery.bin for EEPROM update
EEPROM updates pending. Please reboot to apply the update.
To cancel a pending update run "sudo rpi-eeprom-update -r".
REBOOT to apply update
Now I have the latest EEPROM bootloader
Pudge
EDIT:
My RPi 4b 8 GB RAM device is updated.
Now I have two RPi 4b 4 GB RAM devices and a RPi 400 to update.