# Unable to connect to mcu on kobra 2 **URL:** \ **Category:** General Discussion\ **Created:** [September 11, 2024, 2:57pm UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-on-kobra-2/18755 "2024-09-11T14:57:18Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![brandon1](https://avatars.discourse-cdn.com/v4/letter/b/ea666f/32.png) [@brandon1](https://klipper.discourse.group/u/brandon1)\ **Post date:** [September 11, 2024, 2:57pm UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-on-kobra-2/18755/1 "2024-09-11T14:57:18Z")
### Basic Information: Printer Model: Anycubic Kobra 2 MCU / Printerboard: trigorilla pro b v1.02 Host / SBC Raspberry pi 3b+ klippy.log [klippy.log](https://klipper.discourse.group/uploads/short-url/9lh1Y2O4DLYN653rp6b9nZGLrod.log) (63.9 KB) _Fill out above information and_ **_in all cases attach your_ `klippy.log` _file_** (use zip to compress it, if too big). _Pasting your_ `printer.cfg` _is **not** needed_ _ **Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there** _ ### Describe your issue: I am unable to connect to the mcu for some reason, I dont know why. ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [September 11, 2024, 7:44pm UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-on-kobra-2/18755/2 "2024-09-11T19:44:01Z")
Have you tried ```auto [mcu] serial = /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0 restart_method = command ``` ---
**Author:** ![brandon1](https://avatars.discourse-cdn.com/v4/letter/b/ea666f/32.png) [@brandon1](https://klipper.discourse.group/u/brandon1)\ **Post date:** [September 12, 2024, 12:07am UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-on-kobra-2/18755/3 "2024-09-12T00:07:31Z")
Hi, I have just tried this but it isn’t the fix. ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [September 12, 2024, 5:46am UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-on-kobra-2/18755/4 "2024-09-12T05:46:40Z")
Have you tried different USB cables. Is the MCU flashed properly? ---
**Author:** ![brandon1](https://avatars.discourse-cdn.com/v4/letter/b/ea666f/32.png) [@brandon1](https://klipper.discourse.group/u/brandon1)\ **Post date:** [September 12, 2024, 11:48pm UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-on-kobra-2/18755/5 "2024-09-12T23:48:27Z")
Yes, I have multiple cables that I have tried, i have used power and data cables but same problem. How can i check if the mcu is flashed properly? ---
**Author:** ![ejhones](https://avatars.discourse-cdn.com/v4/letter/e/5f8ce5/32.png) [@ejhones](https://klipper.discourse.group/u/ejhones)\ **Post date:** [September 16, 2024, 5:51pm UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-on-kobra-2/18755/6 "2024-09-16T17:51:43Z")
Are you still having problems? post log. When you run the flash command, the output tells you if the flash is complete. You can use `lsusb` in the terminal to see if the hardware is connected. ![Captura de tela de 2024-09-16 14-48-40](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/2/2699cf16269dd7e98019e0117f399a6531020e19.png) ---
**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\ **Post date:** [October 17, 2024, 3:52am UTC](https://klipper.discourse.group/t/unable-to-connect-to-mcu-on-kobra-2/18755/7 "2024-10-17T03:52:43Z")
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