The Unofficial Apple Weblog has five things you absolutely need to know about the 1.1.1 firmware release, before you upgrade your iPhone and ruin your life. In brief: you cannot downgrade, PSP-style, to earlier, friendlier firmware; it's locked down tightly; you can buy iTunes and upload them back to your computer; there are cool new UI tricks; and media folder access still works.
The fill list, with consequences for your sense of well-being, follows.
5 things you need to know about the iPhone 1.1.1 update [TUAW]
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