Roll Back From 1.6 to 1.4

Can I roll Back from Asterisk 1.6 to 1.4, I originally did a asterisknow install then i upgraded to 1.6 but i would like to roll back, should i do a reinstall?

you’ll have to do a reinstall, but it should be as simple as doing make && make install from your 1.4 source directory and removing any modules the make warns you about.