Iphone software upgrade won't let me restore my backed-up stuff

I have an iphone 3 and I (stupidly) upgraded the software without a sim card in it, without realising that you need an active sim to finish the upgrade and get the phone working again.
I had just been using it as a computer but I had the app NOTES and it was full of personal notes, bank details, passwords etc. And it hasn't been restored. In fact, nothing at all got restored once I finally got another sim card in (different network provider). I'm heartbroken - I can't find it anywhere on my computer, even in the Apple files. Anyone any ideas?

Restore from earlier backup by pressing shift while clicking the restore button, should pop up a folder with previous backups.

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