Installing 4.1.2 update from SD.. ROM Pre-Installation?

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http://androidforums.com – What option do i need to choose here..? The default is Wipe Dalvik Cache but there is also Wipe Data and Cache, Backup Existing Rom. Is there anything else that I need to do or be aware of..? I've already backed up my root with Voodoo OTA. Thanks. (General)