# Cannot connect to MangOH board after rebuild kernel **URL:** \ **Category:** Legato Linux distribution (Yocto project)\ **Created:** [July 29, 2019, 8:16am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595 "2019-07-29T08:16:43Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 29, 2019, 8:16am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/1 "2019-07-29T08:16:43Z")
Hi guys, Recently, i have rebuilt the Linux kernel with the source from SierraWireless. i downloaded the Linux distro source Release 17: [SWI9X15Y\_07.14.01.00 Source] and built it. But actually, after i customize the image by menuconfig, built it and loaded to MangOH Green board, i can not ping to ip 192.168.2.2 and also cannot see the USB connection when i use “lsusb”. Please give the solution. Thanks for reading ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [July 29, 2019, 2:54pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/2 "2019-07-29T14:54:09Z")
Which modification in menuconfig will make this failure? ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 2:41am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/3 "2019-07-30T02:41:01Z")
Hi Jyijyi, I have configured in Multimedia support and i not changed anything in default configuration. ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 2:54am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/4 "2019-07-30T02:54:56Z")
![Screenshot%20from%202019-07-30%2009-53-51](https://us1.discourse-cdn.com/flex019/uploads/legato1/original/1X/56bff0cddbbebbc813a7f537d9edfa264b151488.png) ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [July 30, 2019, 3:56am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/5 "2019-07-30T03:56:56Z")
If you change back to default, can it work? ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 6:52am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/6 "2019-07-30T06:52:55Z")
But now i can not connect to mangOH board via USB cable( can not ping 192.168.2.2). I have tried to use Serial port, but i cannot login into Legato ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 6:55am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/7 "2019-07-30T06:55:59Z")
![Screenshot%20from%202019-07-30%2013-54-35](https://us1.discourse-cdn.com/flex019/uploads/legato1/original/1X/ddad79b0acca8534227fed508b561d7e47379799.png) How can i login into Legato ? ---
**Author:** ![JordanZhao](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jordanzhao/32/789_2.png) [@JordanZhao](https://forum.legato.io/u/JordanZhao)\ **Post date:** [July 30, 2019, 7:58am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/8 "2019-07-30T07:58:22Z")
I think you need to revert back by using swiflash tool: [https://source.sierrawireless.com/resources/airprime/software/swiflash/](https://source.sierrawireless.com/resources/airprime/software/swiflash/) ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 8:38am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/9 "2019-07-30T08:38:03Z")
Hi JordanZhao, i also try to use swiflash tool, but it cannot use when USB connection failed. After rebuild kernel, i cannot connect to mangOH board via USB cable. ---
**Author:** ![JordanZhao](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jordanzhao/32/789_2.png) [@JordanZhao](https://forum.legato.io/u/JordanZhao)\ **Post date:** [July 30, 2019, 8:44am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/10 "2019-07-30T08:44:12Z")
Do you mean there is no more GobiSerial and GobiNet interfaces? Hm… ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 9:12am UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/11 "2019-07-30T09:12:52Z")
When i use “lsusb” command, i cannot see the USB connection. Swiflash just can use if the mangOH board can connect with host machine by USB connection. ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [July 30, 2019, 12:49pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/12 "2019-07-30T12:49:59Z")
Do you mean now you can only see /dev/ttyUSB0 ? ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 1:27pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/13 "2019-07-30T13:27:55Z")
yes, i just see /dev/ttyUSB0 when i connect with mangOH board via Serial port. Can you help me login to mangOH board via Serial port? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [July 30, 2019, 2:24pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/14 "2019-07-30T14:24:02Z")
I think your module is kept in boot mode. What do you see in uart console? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [July 30, 2019, 2:27pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/16 "2019-07-30T14:27:41Z")
There are two usb port in mangoh red board, one is usb, one is uart ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 2:32pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/17 "2019-07-30T14:32:16Z")
I use mangOH Green board, Can you give me solution for this issue, i just need login into Legato ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [July 30, 2019, 2:34pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/18 "2019-07-30T14:34:35Z")
I don’t think you can login as it did not boot up. What do you see in uart console in mangoh green board? Can you recover the module by running one click exe to upgrade the official image in windows platform? ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 2:41pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/19 "2019-07-30T14:41:35Z")
the Screenshot picture is everything i see in uart console. Can you give me some detail information about " running one click exe to upgrade the official image in windows platform" ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [July 30, 2019, 2:45pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/20 "2019-07-30T14:45:22Z")
Can you download the official exe file foe fw upgrade? ---
**Author:** ![htphuoc](https://avatars.discourse-cdn.com/v4/letter/h/d78d45/32.png) [@htphuoc](https://forum.legato.io/u/htphuoc)\ **Post date:** [July 30, 2019, 2:55pm UTC](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595/21 "2019-07-30T14:55:52Z")
Please give me link about this firmware upgrade in Windows, i just use Linux environment when work with mangOH board [Next page](https://forum.legato.io/t/cannot-connect-to-mangoh-board-after-rebuild-kernel/4595.md?page=2)