Nano Pi 2 Fire Setting HDMI

Is there a way through the serial terminal to set the HDMI video settings.
My monitor is not working and I believe the video settings might be to high
for it.

Terminal program, stop boot process, printenv and then setenv with your new
resolution parameters.  Then saveenv.

Be aware you have to type in bootargs without any mistakes or your might
have to start at square one again.

I assume you are using the Debian Jessie image.  I am sure the process is
described in one the Wiki pages for one of the other NanoPi products.

Is is booting properly?  If using the Debian image are you using the latest
one?