How do i update firmware on ender 3. I have had an ender 3 for 3 years now, that have never worked properly. I have tried to use both Creality, Cura and prusa slicers, and lots of differint models to print, none of them seems to work, or rather the print gets fucked up every single time i want to print something, and i have reached a point now, where i´m just about ready to throw the printer i the trash, but first i want to try and update the firmware, but i can´t find a way to do that via the SD card. Can some one help me out here? How do i update the firmware?