Airton Zanon

If you want to flash a microcontroller to be your keyboard you can use QMK for that. You can even use the QMK toolbox to do it, which is a UI that helps you to flash/compile your keyboard mapping and even to already select the kind of bootloader that you use to flash your microcontroller.

If you want to flash a recently edited or something that you changed recently on the configuration file, you might need to use the command line for that. There was when I questioned "How will I do it for the Elite-C?".

I use Arduino Pro Micro for almost all keyboards that I built, but because of micro usb not being the best when it comes to durability, I choose Elite-C to be the microcontroller for one of the keyboards that I created.

So here's how you flash it:

Arduino Pro Micro:

qmk flash -kb sofle -km default -bl avrdude

or stay in the root of qmk_firmware folder and run the command below

make sofle:default:avrdude

With that, the keymap will compile and it will ask flash the Arduino, if you connect reset to ground, it will accept the flash.

Elite-C:

qmk flash -kb sofle -km default -bl dfu

or stay in the root of qmk_firmware folder and run the command below

make sofle:default:dfu

With that, the bootloader used will be DFU instead of avrdudes (used for Arduino Pro Micro). You don't need to do anything in the board to flash it.

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This is simple and easy, but I took a while to find this info, so here it is :D

For more info about QMK and flashing, go to their wiki page https://github.com/qmk/qmk_firmware/blob/master/docs/flashing.md