# MangOH: USB-serial device doesn't create /dev/ttyUSB1 **URL:** \ **Category:** mangOH Green\ **Created:** [July 21, 2016, 4:55pm UTC](https://mangoh.discourse.group/t/mangoh-usb-serial-device-doesnt-create-dev-ttyusb1/168 "2016-07-21T16:55:53Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![hui\_s](https://avatars.discourse-cdn.com/v4/letter/h/71e660/32.png) [@hui\_s](https://mangoh.discourse.group/u/hui_s)\ **Post date:** [July 21, 2016, 4:55pm UTC](https://mangoh.discourse.group/t/mangoh-usb-serial-device-doesnt-create-dev-ttyusb1/168/1 "2016-07-21T16:55:54Z")
Hi- On mangOH Rev8 with WP8548 mounted, I plugged in USB-serial device into USB host receptacle and got this from dmesg: [2164.701693] usb 1-1.3.2: new full-speed USB device number 8 using msm\_hsic\_host [2164.759560] ftdi\_sio 1-1.3.2:1.0: FTDI USB Serial Device converter detected [2164.772378] usb 1-1.3.2: Detected FT232RL [2164.775461] usb 1-1.3.2: Number of endpoints 2 [2164.779795] usb 1-1.3.2: Endpoint 1 MaxPacketSize 64 [2164.785411] usb 1-1.3.2: Endpoint 2 MaxPacketSize 64 [2164.789714] usb 1-1.3.2: Setting MaxPacketSize 64 [2164.802441] usb 1-1.3.2: FTDI USB Serial Device converter now attached to ttyUSB1 and follow by lsusb: Bus 001 Device 008: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC However, I don’t have /dev/ttyUSB1 shown up. Instead, I just have /sys/class/tty/ttyUSB1 shown up. Question is, how to create that device nod as /dev/ttyUSB1? thanks! Hui ---
**Author:** ![awneil](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/awneil/32/486_2.png) [@awneil](https://mangoh.discourse.group/u/awneil)\ **Post date:** [July 23, 2016, 8:55pm UTC](https://mangoh.discourse.group/t/mangoh-usb-serial-device-doesnt-create-dev-ttyusb1/168/2 "2016-07-23T20:55:47Z")
> [@FTDI USB Serial Device - where is ttyUSB0?](http://mangoh.discourse.group/t/ftdi-usb-serial-device-where-is-ttyusb0/92/1): > > Cross-post from Sierra Wireless forum: [quote]When I plug in my FTDI USB Serial cable, I see: [690.149702] usb 1-1.3.2: new full-speed USB device number 7 using msm\_hsic\_host [690.206805] ftdi\_sio 1-1.3.2:1.0: FTDI USB Serial Device converter detected [690.219624] usb 1-1.3.2: Detected FT232RL [690.222615] usb 1-1.3.2: Number of endpoints 2 [690.227071] usb 1-1.3.2: Endpoint 1 MaxPacketSize 64 [690.232748] usb 1-1.3.2: Endpoint 2 MaxPacketSize 64 [690.236929] usb 1-1.3.2: S… ---
**Author:** ![hui\_s](https://avatars.discourse-cdn.com/v4/letter/h/71e660/32.png) [@hui\_s](https://mangoh.discourse.group/u/hui_s)\ **Post date:** [July 24, 2016, 1:30am UTC](https://mangoh.discourse.group/t/mangoh-usb-serial-device-doesnt-create-dev-ttyusb1/168/3 "2016-07-24T01:30:19Z")
Hi awneil, What I am asking is /dev/ttyUSB1. The /dev/ttyUSB0 is actually the USB interface between mangOH and host PC. In addition, I have mentioned that I am using Revision 8 board that is supposed to have the problem fixed in your link. thanks Hui ---
**Author:** ![asyal](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/asyal/32/78_2.png) [@asyal](https://mangoh.discourse.group/u/asyal)\ **Post date:** [July 24, 2016, 5:58am UTC](https://mangoh.discourse.group/t/mangoh-usb-serial-device-doesnt-create-dev-ttyusb1/168/4 "2016-07-24T05:58:18Z")
Hi Hui, What is the firmware revision on your board and legato version ? CM info Legato version ---
**Author:** ![hui\_s](https://avatars.discourse-cdn.com/v4/letter/h/71e660/32.png) [@hui\_s](https://mangoh.discourse.group/u/hui_s)\ **Post date:** [July 24, 2016, 6:24am UTC](https://mangoh.discourse.group/t/mangoh-usb-serial-device-doesnt-create-dev-ttyusb1/168/5 "2016-07-24T06:24:52Z")
Hi asyal It is the latest. I followed the instruction of FAE to update the firmware in module a few weeks ago. thanks! Hui ---
**Author:** ![asyal](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/asyal/32/78_2.png) [@asyal](https://mangoh.discourse.group/u/asyal)\ **Post date:** [July 24, 2016, 7:10pm UTC](https://mangoh.discourse.group/t/mangoh-usb-serial-device-doesnt-create-dev-ttyusb1/168/6 "2016-07-24T19:10:19Z")
Hi Hui, Can you redowload to make sure everything is done properly? I am wondering if something went wrong with your original process. ---
**Author:** ![hui\_s](https://avatars.discourse-cdn.com/v4/letter/h/71e660/32.png) [@hui\_s](https://mangoh.discourse.group/u/hui_s)\ **Post date:** [July 25, 2016, 4:24pm UTC](https://mangoh.discourse.group/t/mangoh-usb-serial-device-doesnt-create-dev-ttyusb1/168/7 "2016-07-25T16:24:31Z")
Hi sayal, Here is what I have now: ![](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/1X/392de4ba993553ac8d73f4d12f44a874b472860a.png) And I followed the guide from [http://source.sierrawireless.com/resources/legato/wpfirmwarerelease10/](http://source.sierrawireless.com/resources/legato/wpfirmwarerelease10/) Please let me know if the process I used is correct. thanks! Hui ---
**Author:** ![asyal](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/asyal/32/78_2.png) [@asyal](https://mangoh.discourse.group/u/asyal)\ **Post date:** [July 25, 2016, 10:28pm UTC](https://mangoh.discourse.group/t/mangoh-usb-serial-device-doesnt-create-dev-ttyusb1/168/8 "2016-07-25T22:28:16Z")
Hi Hui Can you upgrade to the latest firmware : [http://source.sierrawireless.com/resources/legato/wpfirmwarerelease/](http://source.sierrawireless.com/resources/legato/wpfirmwarerelease/) cheers, Ashish