Look into the detailed steps given for Access Asus router using, remote access, USB drive access, access router in AP mode and solution for unable to access router.
Complete Guide for Access Asus router
You can establish either a wired or wireless connection between the ASUS router and the
device. For access Asus router, perform the steps provided below.
Asus Router Remote Access
Navigate to the Google Chrome web browser or other browsers like Internet
Explorer, Mozilla Firefox, or Apple Safari for Asus router remote access.
Visit the ASUS login page by entering the IP address of the ASUS router.
When prompted, fill the Username and Password fields with the correct
Select the Administration option and then click the System tab for Asus router
Click Yes beside the Enable Web Access from WAN option.
Enter 8443 in the HTTPS Port of Web Access from the WAN field.
Hit the Apply button to save the settings for Asus router remote access.
Asus Router USB Drive Access
Insert the USB drive into the respective port.
Open the USB Application window and then turn on the Enable Share feature.
Make sure to turn off the Allow guest login feature.
Check whether you have filled both the Device Name and Work Group fields with
the correct details for Asus router USB drive access.
Select the Enable option from the NTFS Sparse Files Support drop-down menu.
Click Apply and then select the Plus icon to add a new account.
Type the new account name in the Account field.
Enter the password in the Password field and the Retype Password fields.
Select the add icon at the top-right corner of the screen and then click Save
Permission for access Asus router.
Open the File Manager window on your computer and then click Network on the
left panel of the screen.
Find the device and enter the username and password when prompted for Asus
router USB drive access. Read more