iphone i have is
jailbroekn, unlocked(T-mobile) 1.1.2.

i was trying to install some apps but had trouble so i decided
to delete summerboard from installer and reinstall summerboard again
(i dont know why i thought of that). of course i failed to delete the summer board
now it is gone from the main screen on iphone.

To make is short and easy, i thought restoring my iphone using itunes and
1.1.2 firmware file that i used to jail break would be the solution.

to restore using 1.1.2 firmware file, is there anything i need to concern?
or can i just do option+click to restore?
or is there other special way to do so?

im sorry for inconsistent messege. it is really hard to type on iphone
as you might have experience before .

thank you in advance

Thread's title renamed for clarity