Router – Cannot access D-Link DES 3200-10 after resetting account

d-linknetworkingrouterswitch

I've forgot my password and after googling I've found that in recovery mode I can reset my account.
Connected to Switch using console port (VT100+ Keyboard compatible) and pressed Shift+6. I accessed recovery mode successfully.
using the below command I reset (deleted all accounts as it show empty account by running show account)

#reset account

After rebooting I cannot access using empty username and password!
What am I doing wrong ?

                       DES-3200-10 Fast Ethernet Switch
                            Command Line Interface

                          Firmware: Build 4.38.B012
           Copyright(C) 2012 D-Link Corporation. All rights reserved.

Username:

User Access Verification

Username:

User Access Verification

Username:admin
Password:
Fail!
Password: