I'm currently running a tethered JB on 5.0 (iphone 4). When an untethered is released, will I be able to overwrite my tethered with the untethered jailbreak, or will I need a clean install of 5.0 non jailbroken? I'm concerned because if and when an exploit is released not sure if it will support 5.0 or 5.0xx Thanks.