Restoring iPhone From Backup?

Hi, I upgraded my iphone 3gs to 4.2.1 and have no just downgraded it back to 4.1
The only thing is, all my data has been wiped from it.
I have a backup that I made just before I upgraded to 4.2.1 that I want to restore from, however everytime I try to restore it, it asks me to upgrade to the latest version..


Any idea as to what I can do to restore from that backup. The backup is a 4.1 backup, and my current firmware is 4.1
Answer #1
maybe your backup’s a year old or maybe itunes cant restore a backup from a later firmware