reboot switch and enter Bootrom, Ctrl+B

  Main Menu        
                            
    1. Default Startup    
    2. Serial Menu    
    3. Network Menu    
    4. Startup Select   
    5. File Manager     
    6. Reboot   
    7. Password Manager

Enter your choice(1-7):7
        Password Menu    
                         
    1. Modify the menu password    
    2. Clear the console login password   
    0. Return       
               
Enter your choice(0-2):2      
Clear the console login password Succeed!

        Password Menu   
                         
    1. Modify the menu password    
    2. Clear the console login password   
    0. Return       
               
Enter your choice(0-2):0
        Main Menu        
                            
    1. Default Startup    
    2. Serial Menu    
    3. Network Menu    
    4. Startup Select   
    5. File Manager     
    6. Reboot   
    7. Password Manager

Enter your choice(1-7):1

<Huawei> system-view 

[Huawei] user-interface console 0 

[Huawei-ui-console0] authentication-mode password 

[Huawei-ui-console0] set authentication password cipher huawei 

[Huawei-ui-console0] return

<Huawei> save The current configuration will be written to the device.     Are you sure to continue? (y/n)[n]:y 

It will take several minutes to save configuration file, please wait.........    Configuration file had been saved successfully     Note: The configuration file will take effect after being activated

will be more!

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good,thank you for sharing.

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useful document, thanks