The Window 8.1 Pro ISO is Windows 8.1.1. PRO.
If you go to the start menu, you can tell by the power icon in the right corner, which only appears on Windows 8.1.1.
The great news is that we got a Windows 8.1.1 ISO from Microsoft.
For ASUS RT N66U:
WPS button: pressing the Red WPS button while power-up, will clear the NVRAM. All settings are stored in NVRAM of this ASUS router. Clearing the NVRAM is the most efficient way to reset the router to default settings.
That is: press and hold the WPS button, keep pressing...
Some manufacturers provide the same version on their site, that is on the disc. I had the WR-1043ND and that was the case. So, unless they release a firmware update to address a specific detrimental security threat, you may never see another firmware update, or it may take awhile.
Well, they may not be in the red, or anywhere near being in the red, but they have products out there that are reducing profits. Sometimes, they have to just take a hit and move on. It's smart, at this late stage to start moving away from Windows 8 and start focusing on Windows 9.
First, you want to see if the Maintenance schedule is checked. See step 5.