How do i switch server back to "Live" branch ?

I accidently updated my server with app_update 4020 -beta dev validate
How do i switch back to “Live” branch … app_update 4020 validate is not working :confused:

[editline]19th April 2015[/editline]

Fixed.

Just downloaded new server and copied necessary files…

app_update 4020 -beta NONE validate