Hello,
I recently brought a new ender 3 v3 se and it work perfectly until I accidentally let the sd cart in when I turn it on.
At this point, the printer stays at a blue screen when i turn it on. I have update the screen first and tries to update the mainboard, but the blue screen didn’t change a bit. When I put the sd cart with the mainboard firmware inand turn it on, the printer didn’t change a bit.
I use the SD card supplied with the printer.
Sorry for my bad English and thank you for your help.