I've already read this post and a thousand like this one. All my problem (I think) maybe be because the ttyUSB* ports does not being up. All the forums and tutorials that I read show the modem is connected and the ttyUSB* ports is up. Any forum says nothin about ttyUSB* ports is down. When I try to ...

I'm using ZTE MF79S and Ubuntu Raspberry can see the device in lsusb but the divice is a CD-ROM, not USB I already change usb_modeswitch and various commands since yesterday. The USB port seems disconnect. I have found an article which teaches to modify the grub file, but It seems not exist in my Ub...