@TP-Link Thank you for your reply. I've been looking for support team from TP-LINK regarding this. But now then I see you are from TP-Link, I'm confirmed about it. However still i wish the feature...

@terziyski terziyski wrote @RongTuli TL-MR3420 HW v2 is under EOL status - its latest FW release is from 2015 and it's highly unlikely to receive a FW update with the feature in question. Thank you...

In my router there is no schedule reboot option available. I wonder if my routere model will be included in the future using upgrading firmware to be available this important option.