# Reflashed klipper (ender v3 se) and now getting mcu error

**URL:** <https://klipper.discourse.group/t/reflashed-klipper-ender-v3-se-and-now-getting-mcu-error/13367>\
**Category:** General Discussion\
**Created:** [January 21, 2024, 3:37pm UTC](https://klipper.discourse.group/t/reflashed-klipper-ender-v3-se-and-now-getting-mcu-error/13367 "2024-01-21T15:37:19Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![wewu](https://avatars.discourse-cdn.com/v4/letter/w/50afbb/32.png) [@wewu](https://klipper.discourse.group/u/wewu)\
**Post date:** [February 11, 2024, 12:04am UTC](https://klipper.discourse.group/t/reflashed-klipper-ender-v3-se-and-now-getting-mcu-error/13367/12 "2024-02-11T00:04:05Z")

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Hey all,

Finally fixed this after a few weeks of frustration and tinkering. Actually spent about an hour ‘talking to’ chatgpt and one of its suggested resolutions was to check baud rate in printer.cfg.

I didn’t have it.

My thought is that the default baud rate is 250000, but the ender v3 se required 115200. Because of that, I think you have to explicitly set that under mcu settings in printer.cfg.

For anyone else facing this issue, heres what I added to my mcu settings in printer.cfg:

```auto
[mcu]
serial: /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
baud: 115200
#serial: /dev/ttyUSB0
restart_method: command

```

Hope this helps. Just wanted to tie a bow on all this chaos. Thanks all for the help 🙂

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