Unable to update my iphone 4s ios to 5.0.1

dear friends
im experiencing updating problem rite now. i just bought a 4s for my wife yesterday. when i tried updating the ios to 5.0.1 directly from the phone, it showed - 'Unable to Check for Update. An error occured while checking for a software update. and when i tried updating it via itunes, i got this msg - The iPhone "xxx iphone" could not be updated because the firmware file is not compatible.
my internet connection is perfectly ok here. can anybody help me on this?
Thank you

I was finally able to update from iOS 5.0 (9A334) to iOS 5.0.1 (9A406) on my new iPhone 4S.
(Note: I did not try "Reset" in the Settings>General app on iphone as I only noticed it later. Someone may want to try it)
Problem:
Firmware file incompatibility error whenever I tried to update through iTunes. Same issue when trying to do a restore through iTunes, as it attempted to first do an iOS update and failed with the same firmware file incompatibility error. A straight restore from back-up  (right clicking the user device in iTunes) did not fix the problem. On the iphone itself, there was an update badge on Settings, but it said my system was already up-to-date when I tried to update over-the-air, even though the version was still 5.0 (9A334).
Solution (that worked for me at least):
Using iTunes 10.5.2.11 on a PC running 64 bit Windows 7
First did a full back up of  iphone using iTunes
Put iphone into Recovery Mode ( http://support.apple.com/kb/ht1808 ). Erases all user data and settings!
Disconnected USB cable from iphone
Powered off iphone by holding down Sleep/Off button until slider appeared, slid to off, waited until screen dark
Pressed and kept holding Home button while plugging cable back into phone
I still saw the graphic on the iphone that said to plug into iTunes, so I unplugged and re-plugged cable. (I may have released the Home button too soon)
Recovery Mode alert came up in iTunes.
Followed all iTunes prompts to restore phone - it downloaded and sucessfully installed iOS 5.0.1
iphone did not appear in iTunes due to missing pairing file (that made me nervous)
iphone was now at factory settings. I followed prompts on iphone screen to start reactivation process
Eventually the iphone asked if I wanted to restore from a back-up (whew!)
A window opened in iTunes and I was able to select my previous back-up file for the restore
A full restore from back-up then occured
I also allowed a carrier settings update to occur when prompted (not sure that happens in all cases)
When the restore was done I had to re-enter some passwords, but everything was there
iOS is now 5.0.1 (9A406). The whole process took about an hour.
I admit it was risky, but I was prepared to head back to the dealer in the morning if the phone didn't reactivate.
I hope this works for you. Good luck!

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