there is most likely a 4.00 jb coming as karatakos is a dev has released tutorials before and is someone who can be trusted people are saying he wont because of GeoHot aka geoerge hots these people are stupid as karatakos wontt be releasing any keys geo did there is no downgrade unless you buy an e3 flasher about $90 £50 this is your best bet atm as its fairly cheap you will need to know how to solder there are videos on this