Raspberry Pi Forums

Posted: **Wed Jun 03, 2020 4:55 pm**

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

Code: Select all

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 Ubuntu.

Posted: **Thu Jun 04, 2020 12:38 am**

Oliveira wrote: ↑
Wed Jun 03, 2020 4:55 pm
I'm using ZTE MF79S and Ubuntu
Raspberry can see the device in
Code: Select all
lsusb
but the divice is a CD-ROM, not USB

I already change
Code: Select all
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 Ubuntu.

Grub is a bootloader used by x86 Linux distros. A Pi doesn't work that way.

It's unclear what your actual question is. Lsusb will list all attached USB devices. A CD-ROM drive to use with a Pi would, indeed, most likely be a USB device. E.g.:
Note Bus 001 Device 005

Code: Select all

pi@ddc4A:~ $ lsusb
Bus 002 Device 002: ID 174c:55aa ASMedia Technology Inc. Name: ASM1051E SATA 6Gb/s bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge, ASM1153E SATA 6Gb/s bridge
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 0557:2213 ATEN International Co., Ltd CS682 2-Port USB 2.0 DVI KVM Switch
Bus 001 Device 004: ID 0409:005a NEC Corp. HighSpeed Hub
Bus 001 Device 005: ID 0e8d:1806 MediaTek Inc. Samsung SE-208 Slim Portable DVD Writer
Bus 001 Device 003: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
pi@ddc4A:~ $

Posted: **Thu Jun 04, 2020 8:06 am**

It is quite common for a USB mobile/cellular modems to initially act as a CD-ROM drive which contains driver software for Windows computers.

usb_modeswitch is indeed the Linux tool to switch the device into modem mode.

https://tchekbo.wordpress.com/2018/03/3 ... nd-wvdial/ should work or give you enough pointers for Ubuntu.

Posted: **Thu Jun 04, 2020 6:15 pm**

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 execute the pppconfig, only the ttyS0, ttyS1, ttyS2 and ttyS3 ports are displayed.

There are no ttyUSB* ports into /dev/

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