If you follow these steps you should be able to reset the password back to default.

Resetting password on PT JOY G1/G2/G3

  1. Check the keyboard's IP address on keyboard;
  2. Use a computer to open the command prompt (CMD), and then telnet + space + IP;
  3. Enter the user name root, enter, enter the password ielink when (entering the password, it is not visible), enter. 
  4. Enter the command rm / mnt / mtd / admin_conf, and re-power the keyboard, the password will be restored by default. (Default is empty)