# Can't get MCU ID from Ender 3 **URL:** \ **Category:** General Discussion\ **Created:** [January 24, 2023, 6:38pm UTC](https://klipper.discourse.group/t/cant-get-mcu-id-from-ender-3/6165 "2023-01-24T18:38:41Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![jztechboy](https://avatars.discourse-cdn.com/v4/letter/j/c68b51/32.png) [@jztechboy](https://klipper.discourse.group/u/jztechboy)\ **Post date:** [January 24, 2023, 6:38pm UTC](https://klipper.discourse.group/t/cant-get-mcu-id-from-ender-3/6165/1 "2023-01-24T18:38:41Z")
### Basic Information: Printer Model: Ender 3 MCU / Printerboard: Not Sure? `klippy.log` Not sure what this means. ### Describe your issue: I am a Klipper noob, I have never used it before. I am trying to use a laptop to run Klipper (boo raspberry pi shortage). It is running the latest version of Linux Mint Xfce. I have successfully downloaded the KIAUH and can navigate to the Mainsail interface through my web browser. I am stuck on identifying the MCU connection that I have with my Ender 3. I have plugged the USB from the Ender 3 to my laptop and have tried running the _run ls /dev/serial/by-id/_ but keep getting errors. I have tried issuing this command both from the laptop itself, and also on a separate desktop using PuTTy to get into the laptop. I believe this to be the last thing in my way to actually using Klipper for the first time. I’ve read guides and watched videos, I understand how I will have to update the config file and everything going forward, but as Mainsail cannot detect my printer until I inform it of the usb/serial id I cannot go further (if I am understanding this correctly). Anything helps, again I am an absolute noob and may be missing something obvious. Thanks! ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [January 24, 2023, 6:51pm UTC](https://klipper.discourse.group/t/cant-get-mcu-id-from-ender-3/6165/2 "2023-01-24T18:51:47Z")
There are different Ender 3 versions and these need different approaches how to flash and different configs. Open the printer and identify its board. ---
**Author:** ![jztechboy](https://avatars.discourse-cdn.com/v4/letter/j/c68b51/32.png) [@jztechboy](https://klipper.discourse.group/u/jztechboy)\ **Post date:** [March 9, 2023, 7:52pm UTC](https://klipper.discourse.group/t/cant-get-mcu-id-from-ender-3/6165/3 "2023-03-09T19:52:45Z")
Wow does life get in the way of things. Thank you for your response. I have attached a picture of the board, but it says Creality V.4.2.7. I assume this answers your question as I did not see any other text on the board that seemed relevant (at least without unplugging things more) ![20230309_134834](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/2/201533eb2054f3e633e31fc5382bf822beea56e9.jpeg) ---
**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\ **Post date:** [March 9, 2023, 8:25pm UTC](https://klipper.discourse.group/t/cant-get-mcu-id-from-ender-3/6165/4 "2023-03-09T20:25:42Z")
> ---
**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:** [May 5, 2024, 9:37pm UTC](https://klipper.discourse.group/t/cant-get-mcu-id-from-ender-3/6165/5 "2024-05-05T21:37:41Z")