No network when roaming with iOS 4.3.5

I have been using my - simlockfree - iPhone 3GS for more than two years with the same contract. Yesterday I upgraded to iOS 4.3.5, and starting today the iPhone does not find any network when roaming. I am living in Austria, my provide is A1. Usually there is no problem to travel to Italy, where my iPhone can choose between several 3G carriers. Today: no network found all over northern Italy, and also with frequent rebootings. Also resetting the network does not help at all...
Seems that there is a bug in 4.3.5.
Any remedy available ? Any work around ??
Michael

Yes, I know. It is not supported. But it is possible !! I found out a way to downgrade, but it is not even necessary.
Before going into the unsupported realms I tried the supported last resort: a "Full Restore".
It took about 2 hours to download the 420 MB 4.3.5 upgrade to my Macbook Air using a HUSPA USB-modem, and of course syncing and backing up the iPhone to the MBA did NOT save all the content I have on the backup in my Mac Pro back home, but after the full restore it found the local networks, and now I can at least use the iPhone again.
Summary: never travel with a recently upgraded iPhone and without a Macbook with a reliable alternative internet access setup.
And many thanks to Hutchison 3 for providing "3 like Home" roaming without any roaming charge...

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~~~~~~~~~~~~~~~
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