You'll have to be vigilant to only turn on the wifi for a very, very, short time to do a sync and then immediately delete the partial update download, or fill the storage so that there isn't room for the update to download and keep it that way, or go ahead and do the jailbreak and then install & activate the RenameOTABin package. There's no simple way to get around the update and still use the device normally.
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