Do you mean this.
If you have a CM5 lite and are having problems with the sd card booting. Try this solution by @paragonnov Your CM5 lite has to have updated firmware that was released after 2025-01-06. Check using vcgencmd version to update sudo rpi-eeprom-update
sudo rpi-eeprom-config -e To edit the eeprom.
backup current config, then replace with: