Youtube Support has a video for this process here: https://www.youtube.com/watch?v=mC1mVN1NCl4
Youtube Support has a video for this process here: https://www.youtube.com/watch?v=4-Js4WMI5V0
Please start by downloading the appropriate firmware file (check the sticker on the router for the revision number):
RT-N12 Ver D1 Firmware File Version 18.104.22.168.378.6975 (July 27th, 2015)
(Please refer to Asus's support site: http://support.asus.com if your revision is not listed here)
Next we need to tell the router about this file by logging into the router by going to http://192.168.1.1
The default username and password are both admin
The firmware upgrade page is just a click away, just click on the indicated link below.
After you are on the firmware upgrade page, use the browse to find the new firmware file you downloaded (should end in .trx) and then click on the upload button to allow the router to start the process.
The router should provide a progress meter as it applies the new firmware update. Asus recommends performing a factory reset of the router after updating the firmware, so keep this option in mind if you have any issues after.
Asus support hotline: 1-812-282-2787
Monday – Friday, 4:30AM – midnight, Saturday – Sunday, 5:00AM – 2:00PM
Keywords: asus, asus wireless router, rt-n13u, rt-n12, firmware, encryption, wifi password