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If you are using multiple micro-controllers and they do not have unique ids (common on boards with a CH340 USB chip) then follow the directions above using the command `ls /dev/serial/by-path/*` instead.
When the micro-controller restarts the device changes to /dev/ttyUSB1
Follow the directions in the "[Where's my serial port?](#wheres-my-serial-port)" section to prevent this from occurring.
The "make flash" command doesn't work
The code attempts to flash the device using the most common method for each platform. Unfortunately, there is a lot of variance in flashing methods, so the "make flash" command may not work on all boards.
If you're having an intermittent failure or you do have a standard setup, then double check that Klipper isn't running when flashing (sudo service klipper stop), make sure OctoPrint isn't trying to connect directly to the device (open the Connection tab in the web page and click Disconnect if the Serial Port is set to the device), and make sure FLASH_DEVICE is set correctly for your board (see the [question above](#wheres-my-serial-port)).
However, if "make flash" just doesn't work for your board, then you will need to manually flash. See if there is a config file in the [config directory](../config) with specific instructions for flashing the device. Also, check the board manufacturer's documentation to see if it describes how to flash the device. Finally, it may be possible to manually flash the device using tools such as "avrdude" or "bossac" - see the [bootloader document](Bootloaders.md) for additional information.
How do I change the serial baud rate?
The recommended baud rate for Klipper is 250000. This baud rate works well on all micro-controller boards that Klipper supports. If you've found an online guide recommending a different baud rate, then ignore that part of the guide and continue with the default value of 250000.
If you want to change the baud rate anyway, then the new rate will need to be configured in the micro-controller (during **make menuconfig**) and that updated code will need to be compiled and flashed to the micro-controller. The Klipper printer.cfg file will also need to be updated to match that baud rate (see the [config reference](Config_Reference.md#mcu) for details). For example:
The baud rate shown on the OctoPrint web page has no impact on the internal Klipper micro-controller baud rate. Always set the OctoPrint baud rate to 250000 when using Klipper.

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Screenshot 2021-06-21 at 11-24-51 KevinOConnor klipper-translations
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String age
2 years ago
Last updated
12 months ago
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Translation file
docs/locales/en/LC_MESSAGES/FAQ.pot, string 14