RE-ENABLING VIRTUAL CD-ROM HIDDEN FEATURE IN ALL HUAWEI DATA CARD WHICH DISAPPEAR AFTER FIRMWARE UPDATE

To re-enable virtual CD-rom or enable hidden features in Huawei data card you can use "AT- command" below is the way to do that read it carefully.

Huawei AT-commands

note: Some devices like the Huawei K3715 seem to require AT-commands to be typed in capital letters!

There are a couple of options for disabling and re-enabling the following USB-components of Huawei USB-modems:

• modem (M)
• NAND-flashmemory drive (CD)
• microSD-drive (SD)
• PC UI interface (UI)
• network adapter (N)
• smartcard (SC)

To disable or re-enable those components run the following AT-command, where n is one of the numbers from the table below:

AT^U2DIAG=n

On some models it is possible to read the present value of the parameter n by sending command:
AT^U2DIAG?
n    M    CD    SD    UI    N    SC    remarks    supported by
0    +            +                E160, E1750
1    +    +                       
3    +            +        +    won't work on devices without SC*   
5        +        +    +        won't work on devices without N*   
9        +            +    +    won't work on devices without N & SC*   
10    +    +                +    won't work on devices without SC*   
12        +        +    +        won't work on devices without N*   
255    +    +    +    +    ?    ?    reset to factory defaults    E160, E160E, K3565, K3715
256    +        +    +            for most devices: everything enabled except the flashmemory; microSD-drive will be available under Windows even without drivers installed    E160, E160E, E173, E1750, E1762, K3565, K3715
257    +    +    +                   
259    +        +    +        +    won't work on devices without SC*    E173u-2, E176
261        +    +        +    +    won't work on devices without N & SC*   
265        +    +        +    +    won't work on devices without N & SC*   
266    +    +    +            +    won't work on devices without SC*   
267        +    +        +        won't work on devices without N*   
268    +    +    +    +            won't work on devices without N*    E1750, K3565, E173
276    +    +    +    +    +    ?    reset to factory defaults    E1762, K3565, K3765, E173, E1750


*) note: Smartcard (SC) and network adaptor (N) are not present in many Huawei devices. Using an AT-command that activates SC or N on a device without these components, will result in errors and so will be noneffective. 
Modems supporting AT^U2DIAG? command: E173, E1750 ,E160E Modems not supporting AT^U2DIAG? command: E160, K3565

Also on some models it is possible to display a list of devices present in a USB-stick, by sending a command:
AT^GETPORTMODE.

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