Though I haven't done it myself ... there are two ways to approach this.
1 - You could install v4 without having it restore the data. In other words, when it gives you the restore options, make sure there isn't an asterisk next to "data".
2 - You could also just do a backup of your current data using the nandroid backup/restore console. Then after installing v4, restore your data from v3.
Either way, first create a complete nandroid backup of v3 with everything. That way you can revert back if something doesn't work quite right.
in a previous post someone said that there are downsides to doing it this way. like i may lose some of the things to the creator put in the data file... is that going to be an issue if i restore my previous data?
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