How to automatically reboot the NR5101 by schedule

Hi

I would like to reboot my zyxel NR5101 at 05.00 AM every sunday morning.

I have found some shell commands like :

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As example the following for a reboot:

1. Login into the Zywall/USG via console/telnet/SSH.
2. Enter the following commands:
   configure terminal
   reboot
3. Save the file as reboot.zysh. It's only important, that it's file extension is zysh.
4. Upload the script on the Zywall/USG.

Setup the schedule for the script

1. Login into the Zywall/USG via console/telnet/SSH.

Router# configure terminal
Router(config)# schedule-run 1 reboot.zysh weekly 10:00 sun
The device will reboot every Sunday at 10 o'clock.

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I can telnet to my NR5101 just fine but the above commands do not work here.

Can somebody give me a guide to make it work, please :-)

Kind Regards