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Prusa firmware - upgrade to 3.9.1

[last updated: 2022-11-23]
go to: 3d printing home page
go to: Prusa Firmware home page
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Detailed steps for updating Prusa Mk3 firmware:

  • Prusa instructions:
    (link to:) Prusa - Firmware updating (MK3S/MK3)
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    • Download the firmware software:
      • Go to (link to:) Drivers page
      • Scroll to find "Original Prusa I3 Mk3"
      • Under "Firmware 3.9.1", click Download
      • Select Save file
        On my Linux system this put the zip file (prusa3d_fw_3_9_1_MK3.zip) into the downloads folder
        I created a folder (Tech/3dPrinting/Prusa/software/firmware/prusa3d_fw_3_9_1_MK3) and put the zip file there
    • Update printer firmware:
      • Connect USB cable between your computer and the printer.
        Turn on the printer.
      • Open PrusaSlicer
      • Configuration (top menu bar) > Flash printer firmware
        If your printer is not listed in the "serial port" field, press ReScan
      • Click browse icon at far right of the Firmware image field, and navigate to your downloaded and unzipped firmware folder
        select: prusa3d_fw_MK3_3_9_1...hex, then Open
      • click Flash!
      • when "Flashing succeeded," click Close
      • disconnect USB cable
      • LCD Menu - Support should show new version of firmware

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