Hello yesterday we put new firmware in my ender 3 1.1.4 board . we used the file from creality side Ender-3 1.1.4 mainboard（8bit）.zip.
I used the way in the youtube movie from Creality with the cable , evrything is going well the upload is ok but when we restart the printer the sreen stay's in the bootscreen and we can't do anything anymore.
Can someone tell what we did wrong.
Best Regards Henk.