Boot question

[dvserg]

Hi

I have in office 2 pfSenses on one HDD(manager installed from CD with my instruction via phone).
While begin system starting i view 2 text:

F1: pfSense
F2: pfSense

Default: F1

(no GRUB?)

But "F1 pfsense" is broken, how i can set 'Default: F2' via WebGUI/SSH for auto-starting good pfSense copy? I can't nothing do via console  - office in other town.

Thanks.