Scheduling method for guest network in TPlink (TD-W8960N) ADSL modem [closed]

I have the ADSL modem like this: enter image description here

and i want to have one time scheduled sharing internet, but the TPlink page not have the time schedule as you can see here:

enter image description here

I have tried this upgrade file but no change in the guest network options.

And see the page of TPlink site which said Archer D2 and TD-W9980(B) have this option,

I was thinking to find some auto web scraping script to automatically open the guest network setting page on my modem page and tick this option in the modem every day, but i have doubt which, this work have bad effect on the modem and maybe this action reset it every day and damage it!.

So what methods do you suggest to do this?