Also, there seems to be a bug in Settings->USB Sharing->User.
Steps:
1.) After you reset the router, create a new user "samarth" with password "samarth".
2.) Now create another user with username "user" with blank password "". Save it.
3.) Now when you check the username "user" again, the password would be set as "samarth" the password of first user instead of blank "".
If in step 2, you set password as "user", then after saving the password would become "userrth", characters 5th, 6th & 7th if blank would be replaced by password of first user.