ZTE MF668 doesn't want to switch to modem-mode

[ebendl]

So my black Cell C ZTE MF668 modem decided it doesn't want to switch to modem-mode (from the CD-ROM emulation) mode any more. I noticed last night that it continues hangs on "Initializing modem" in the router - then disconnects, then resets the port, then tries to initialize modem, then disconnects etc.

I plugged it into my Windows 8 machine and the CD ROM starts. Then, when I start the Cell C software, it eventually sees that the modem is plugged in, but can't see the SIM. When I close it and open Putty to send AT commands to it, it connects, but doesn't respond to any command I send it (I just get nothing out). The same happens on my Windows XP laptop.

Eventually I plugged it into my wife's Macbook Pro - and there it works beautifully. This made me think that it isn't a modem problem as such, but rather that the switch from CD-ROM mode to modem-mode doesn't happen correctly in Windows (or my router). Pain is, I can't disable the auto-run feature without access to a terminal where I can send AT commands. And nothing happens in Windows.

Any ideas? Or how do I send AT commands to it in Mac OS (I've hardly used it).

 

[Cell_C]

Hi,

Please PM your contact number sot that we can assist.

Regards
CellC|TM

 

[sajunky]

Pain is, I can't disable the auto-run feature without access to a terminal where I can send AT commands. And nothing happens in Windows.

I don't see from your description what really problem is, but answer to above question is YES, you can without tweaking registry
- You can press and keep left shift while inserting modem till drivers are initialized
- In XP (not sure of 8) you can disable drive letter for emulated CD-ROM device. It works if you plug modem in the same USB socket. It breaks sometimes when Windows decide to install different set of drivers.

Besides, take a look in Device Manager at COM port you are trying to access from the terminal program. This modem installs two COM ports: for modem and diagnostic. You can use both to issue AT commands. Modem port is used by Windows dialup, diagnostic is used by dashboards to monitor connection.