lvxferre , 7 hours ago

Have the router ask the server if there’s an update available when turned on. If none, proceed as usual; if there is, force the update, regardless of the time of the day. Problem solved.

Of course, for that you need to acknowledge that you violated the “ask, don’t be an assumer” rule, instead of bossing customers around with “golden rules”. You won’t change their silly and pointless habits anyway.