Samsung Galaxy J4 2018 (j400f) How To Into Download Mode
J400f Download Mode
Step 1- Power of the smartphone reconnect the battery.
Press vol down key + home key and insert USB cable that is connected to a computer to mobile phone. The below picture will show you the exact way.
you will see like this window now press volume up key and finally, got Download Mode.
Follow the video guide how to put j600f into Download Mode