• Open the plastic case by gently squeezing the top part and lifting it while holding the lower part.
• Install your voice board
• Connect Kraftor to your computer via USB.
• Double-click on the reset button
• A new drive named “KraftoBOOT” will show up on your computer, and the MIDI LED will start to glow gently
• Drag the firmware ending with “.UF2” to the “KraftoBOOT” drive
• Done! : Kraftor will restart using the newly installed firmware

Kraftor uploader

If you just want to update the firmware without changing the voice board, you can also do everything remotely via USB without opening the case.
Use this small utility in your browser : 

You can run the utility one line here  https://deladriere.github.io/samd21_UF2_uploader/

or access the source code here :

GitHub - deladriere/samd21_UF2_uploader

deladriere/samd21_UF2_uploader
To upload your firmware into Kraftor

Option 1 ( requires the Emy version 2.1 or bigger to be installed first)

• Download the firmware
• Save it on the SD card with a name that makes sense to you (like “emy.bin” )
• load it from the code>flash menu.
• If changing the add-on vox :
  • switch the power off
  • install the add-on vox
  • re-apply power

Note This function simply

• copies the firmware “blalbla.bin” to “firmware.bin”
• reboots the system
• deletes the firmware.bin
• keeps the original with its name.

You can keep all the firmware on the microSD card and call them whenever you change the add-on vox

Note : Change the firmware before changing the add-on vox

Option 2

• Download the firmware
• Save the firmware exactly as “firmware.bin” on the SD card (and not “blabla.bin”)
• Re-apply power