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, and then enter the command rm / mnt / mtd / admin_conf, and then re-power the keyboard, the password will be restored by default. (Default is empty)