Geeetech A30 no COM selected

[Michi785]

Hallo

I made the Firmware update on my 3D-Printer and now i can not conect the printer with my Computer.
The error message is " no COM selected". I don't disconet the USB-cabel.
And the touchscree of the 3D-Printer is black.

Error.PNG (9.39 KiB) Viewed 2328 times

Please help me.

[William]

You need to check the USB drivers install correct or not(CH340C)
Then you need to insert the sd card to A30 printer.
Restart it and upload the firmware for LCD.