RTC -EREMOTEIO Error

Symptom: dmesg shows rtc-pcf85063 ...: error -EREMOTEIO: RTC chip is not present.

This is expected and harmless on FIBER Lite. It means the Configure Hardware step was followed using the FIBER (CM4) tab's config.txt block instead of the FIBER Lite tab, including the external RTC overlay line. Remove any dtoverlay=i2c-rtc,... line from /boot/firmware/config.txt and reboot; the Raspberry Pi 5's native built-in RTC (rtc0) does not need it.