Iphone cannor be restored. unknown error occured (1654)

Have I just lost all my data? ..after syncing to 5.1 (from 4.3)
Can anyone please help?

So Finally I have the solution!!!
After my phone said "unknown error occured (1645)"
Some experts said I destroyed the baseband.. but it was not exactly the case...
my phone - after installation process finished to ios 5.1 said thet the restore file was either damaged or the phone is not compatible
but do not get scared - it seems pretty normal
on the phone, chose "set up as a new Phone"
follow the instruction on the creen, sign in with your apple ID, create iCloud, connect to WiFi (this may not be the  correct cronological order, but you will know what I mean) create and do everything it says, and at the end, you will get the half of the job done...
At this point, I had all my accounts back on the phone, text messages, all the contacts in the list, my recent calls' list etc.. everything but my apps. But since I created a back up of the old phone and also I synced the apps, I had all my apps in my iTunes
So, simply I had to choose the apps I wanted to have back on the phone, and synced them
so it was dome!
Everything is back to normal
FYI
Some collected background information for those who need to understand the reasons - or get some clue...
Changing so much - ios 4.3 to ios 5.1 means a very steep gradient for the phone, so there is no way of restoring the phone if ios 5.1 got installed, but it is not the end of the story, as luckily I LOST nearly NO DATA, whatsoever... (only music - as I had not stored my mp3s on my PC - but I can put them back any time)
Since this ios update changed the baseband of the phone it refused to get the old back, that was the reason why I could not restore back up, when I thought something went wrong.
Thanks for the helping words anyway
(read previous posts to make sure you had backup, software upgrade etc...)

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