This isn’t new information, so I don’t understand why everyone seems so shocked that switching between Motorola builds and AOSP builds requires a data wipe. If you’re not sure whether you’ll need to wipe data, then there’s no reason to do it preemptively, but if your phone boot loops after you install a ROM, pull the battery, boot in to recovery (hold the X button while powering on) and do a factory restore.
I strongly recommend that everyone go download Titanium Backup from market (it’s free). It can restore apps with their data after switching to a new ROM that requires a data wipe. Make sure you do this before you install the ROM, or it will be pretty useless.
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