I am using an Fx30 with the official firmware (R13.1.2.004).
I have update the date manually and with NTP, and used “$> cm rtc set”.
But after a power off, if the GSM is not present, I do not have the date any more.
the system date is at “Sun Jan 6 00:13:00 UTC 1980”, and “cm rtc read” returns “01 Jan 1970 00:13:55”.
If the rtc is backed up by a battery, how should I do to save and retrieve the time?