Running a 1.1.1 Jailbroken/sim-unlocked iPhone,

Accidentally followed this guide & Replaced my SpringBoard with a patched version intended for 1.0.2 firmware. (Stupid, I know, but I didn't read properly)

Anyway, iPhone crashed, and now when i start it up I just get the Apple logo.

Is there a way I can replace the SpringBoard file i changed? I made a backup. Erk