I don't see how doing a factory reset would brick a phone. They kinda built it in for a reason but please enlighten me. I has an original galaxy and the charge and both were wipe first.
Edit: I googled it real quick and there are whole guides on wiping before flashing
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Actually it is a epic touch issue and cwm issue. I earlier just glanced through the thread because a friend told me about it. But after going back, It was really more to do with flashing a ics Rom and then flashing a backup of gingerbread. The partitions were different as to what was stored on them. Causing the issue. I was told this was only an issue when using cwm version 9.
But as far as restoring a backup from custom recovery, there is no reason to wipe as everything is being cleared during the backup process.