Problem connecting to N300 Wifi Range Extender WN3000RPv3

Please help me! I set up a range extension around a month ago, and the setup went smoothly. Today I logged into mywifiext.net to change the extender's password to be different from the one of the Wifi network. Following this I've been unable to connect to the extender. It doesn't prompt me for a password and I'm unable to log back into mywifiext.net as I'm not connected to the extender. I've tried restoring it to factory default settings but nothing happened.