when you enter con2fbmap10.. there is a space on either side of the “1”?
con2fbmap 1 0
If you dont have it, then you would need to install it
sudo apt-get install con2fbmap
When using con2fbmap, the change is instant and there is no need to reboot.
Just to be sure… do you see anything out the HDMI port? E.g. colors as the Pi boots?
Mark --OzzMaker.com --