Unable to upgrade privilege level because of superuser configuration

Publication Date:  2014-03-20 Views:  1002 Downloads:  0
Issue Description
Customer was unable to connect to device CLI. Check the configuration we saw that super user password was configured and this overule local user authetication. 
Device version:

Huawei Versatile Routing Platform Software
VRP (R) software, Version 5.120 (AR1200 V200R003C01SPC900)
Copyright (C) 2011-2013 HUAWEI TECH CO., LTD
Huawei AR1220 Router uptime is 0 week, 2 days, 12 hours, 24 minutes
BKP 0 version information:
1. PCB      Version  : AR01BAK1A VER.A
2. If Supporting PoE : No
3. Board    Type     : AR1220
4. MPU Slot Quantity : 1
5. LPU Slot Quantity : 2

MPU 0(Master) : uptime is 0 week, 2 days, 12 hours, 24 minutes
SDRAM Memory Size    : 512     M bytes
Flash Memory Size    : 256     M bytes
NVRAM Memory Size    : 512     K bytes
MPU version information :
1. PCB      Version  : AR01SRU1B VER.C
2. MAB      Version  : 0
3. Board    Type     : AR1220
4. CPLD0    Version  : 104
5. BootROM  Version  : 654

authentication-scheme default
authorization-scheme default
accounting-scheme default
domain default
domain default_admin
local-user ft password cipher xxxxxxxx
local-user ft ftp-directory flash:/
local-user ft service-type ssh ftp
local-user ftp2 password cipher xxxxxxxxxx
local-user ftp2 ftp-directory flash:
local-user networks password cipher xxxxxxxxxxx idle-timeout 60 0
local-user networks service-type telnet terminal ssh ftp
undo local-user admin

We can see that privilege level is not configured. We will need to enhance privilege level. 
Alarm Information
when we try to upgrade privilege level we receive this error. 

Error: Low-level users are not allowed to create, delete, or modify high-level users.
Handling Process
This problem appear because of superuser password configuration. How to solve this:

1.       Disable super user password
[Huawei] undo  super password level 3

2.       Then log off and log on again
3.       Try to adjust privilege level for ftp/ssh user.
Root Cause