Take note:
Quote:
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If an update is performed using data from another source, by another method, or with a PSP system that has been altered or modified in any way, the PSP system may not operate properly and may not be able to install the official update data. Any of these actions may void the PSP system warranty and affect your ability to obtain warranty services and repair services from Sony Computer Entertainment.
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The word 'may' is such a weasel word... They're not actually going to do anything to stop people from updating from custom firmware to official firmware, you can be sure of that.
No, they're just trying to scare you.