1. Just try and boot without the MF636, You need to wait for the system to stabilize, After doing that open a terminal window, Now try and plugin the modem, after plugin you need to wait for 15-20 secs and then run command: lsusb
If you see 19d2:0031 go to step 3.
2. The modem responds 19d2:2000. You may use a special program called usb_modeswitch but I preferred to send the AT command AT+ZCDRUN=8 from a Windows PC to the modem (use HyperTerminal or add it as an extra init command through control panel).
This command turns off the AUTO RUN function of the internal CD, if you want to return to default you have to send AT+ZCDRUN=9.
Test again the terminal command lsusb to be sure you have 19d2:0031
3. Make a new "rule" for MF636 to create the usbserial communication port (/dev/ttyUSBx).
From terminal run: sudo gedit /etc/udev/rules.d/90-zte.rules
ACTION!="add", GOTO="ZTE_End"
#
SUBSYSTEM=="usb", SYSFS{idProduct}=="0031",
SYSFS{idVendor}=="19d2", GOTO="ZTE_Modem"
#
LABEL="ZTE_Modem"
RUN+="/sbin/modprobe usbserial vendor=0x19d2 product=0x0031",
MODE="660", GROUP="dialout"
#
LABEL="ZTE_End"
Save and Exit from gedit.
4. Edit HAL info to see MF636 instead of MF628. From a terminal window:
sudo gedit /usr/share/hal/fdi/information/10freedesktop/10-modem.fdi
Search (ctrl-F) for 19d2, go to line after "<!-- ZTE MF628 HSDPA USB dongle -->" and change usb.product_id from 0015 to 0031
Save and exit from gedit.
NOTE: this edit must be done again if an Ubuntu update restores the file 10-modem.fdi to defaults!
5. Remove modem from USB port, and reboot it, now you need to wait for some time for the system to stabilize,now try and plug in the modem. After a while a message will appear over the Network Manager icon (2 PC screens up right) and help you create a Mobile Broadband connection. After created click to Network Manager Icon, and click to your provider.
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