If your already running a recent version of cm7 on your bolt then there's no need to wipe.
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Friday, July 29, 2011
CyanogenMod 7.1.0 RC1.4
@LayherDaddy has released the newest cyanogenmod for the thunderbolt. This release features android 2.3.5 gingerbread. Check out the htc thunderbolt page for a link to this and the latest gapps or check out the new cyanogenmod section in rom manger.