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:then type the password, and the default password is 'root' also.
:Then save & '''reboot''' the device;
X680
,1. switch to 'root' user
su root
2. Switch OS to writable mode
3. Edit the /boot/config.txt file, and change line <code>dtoverlay=i2c-rtc,pcf8563</code> to <code>dtoverlay=i2c-rtcds1307</code> (due to use the different RTC chip).
sudo nano /boot/config.txt
4.Test & setting RTC, write&read the time of Raspberry Pi to RTC DS1307