Changing kernel in grub 2

[Terry Polzin]

On Fri, 2012-02-03 at 12:19 -0700, don fisher wrote:
> I have been using grub1, where you could edit the menu.1st command to 
> change kernels. The only place that I see the kernels listed is in 
> /boot/grub2/grub.cfg which is generated by the files in /etc.
> 
> If the current kernel does not work as desired, how does one choose the 
> previous kernel? The only choices I see are:
> 
> 1. edit the script that says do not edit
> 2. remove the bad kernel from /boot and run grub2-mkconfig
> 
> Please advise. Once boot is broken, it is really bad!
> 
> Thanks,
> don

https://flyingpengwin.wordpress.com/2011/12/15/fedora-how-to-change-the-boot-order-in-grub2-to-windows-7/

google search: grub2 boot order change fefora