@montalex: If you were already using mine in the first place, and it wasn't a freakishly old version, you *should* be okay, but at the very least do a complete reboot, just in case.
If you were using Yifan's jailbreak, it might get a bit hairy. Try to uninstall one, reboot, uninstall the other, reboot, and then install the latest version.
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