New iphone 3gs bricked by changing to ipad baseband - will apple be able to tell?

I couldnt get it unlocked from my network so i jailbroke it and tried unlocking with ultrasn0w - at which point everything was fine but the unlock didn't work - i found online instructions saying to change the baseband…

So it has now been bricked by downgrading to ipad baseband (which shouldnt have been done as the baseband chip is not compatible)

I tried restoring using itunes and it said restore failed and now all it will do is show me the 'connect to itunes' screen.

Its brand new - Would apple replace it or will they be able to tell what I did to it?

Added (1). Now it won't do anything other than show the apple screen and itunes isn't recognising it

Put it in DFU mode and rescue it that way

1. Turn your phone off
2. Open iTunes and connect the iPhone to your system.
3. Press and hold the Home button and the Sleep/Wake button at the same time.
4. After exactly 10 seconds release the Sleep/Wake button. Continue holding the home button until you iTunes pops up a message telling you that it has detected an iPhone in recovery mode. The iPhone screen will remain black

It may take a few attempts to get your iPhone into DFU mode. Generally, I hold down both buttons then release the Home button just before I think the Apple logo would appear. If you are still holding both buttons down and you see the Apple logo you are holding them down for too long

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