The Huawei USB modem also emulates a CD-ROM and have a SD card reader. In particular, the CD-Rom feature can be quite annoying when you only want to use the modem.

In order to enable disable the modem features, you need to connect to the modem; use any terminal program (like minicom in Linux or Putty in Windows) to connect to the modem. Once you’re connected successfully, you can use the following commands:

  • To enable modem and SD card reader (no CD-ROM): 
    AT^U2DIAG=256
  • Enable only modem: 
    AT^U2DIAG=0
  • Enable modem and CD-ROM (no SD card reader): 
    AT^U2DIAG=1
  • Enable everything: 
    AT^U2DIAG=255