The normal 30/30/30 reset does not work for the TP-Link TL-WR1043ND running OpenWRT. OpenWRT provides a failesafe mode from where you can recover any configuration mistakes. For the TP-Link TL-WR1043ND:

1. Power up the router
   
2. When SYS button starts to blink, press and hold the QSS button till SYS starts to blink faster
   
3. Telnet to 192.168.1.1. No password needed.
   
4. Erase user space data with
   

   mtd -r erase rootfs_data
   

   
   or mount the jffs2 file system with:
   

   mount_root
   

   
   and start fixing things.