Hi - I'm still on 5.1 & would like to add a few packages (I.e. PDANet for tethering & NCSettings). I have several "critical updates" showing in Cydia (been a while since I DL'd any packages). If I update these (like Mobile Substrate), will I get a version that's not compatible with my old 5.1 that's on the phone now? I don't really want to go through the trouble up updating to 6.1.X & re-jailbreaking, just want to add some packages. If adding these will mean downloading an updated version that's only compatible w/ 6.X.X & not my current 5.1, thus causing conflicts/errors, then I can live without it. Anyone on an older iOS tried updating the "critical" packages w/out updating their iOS before? Thanks!