Some of questions Please ?!!

I have some of questions from PS4 jailbreak
As I read, PS4 can only be hacked with OFW versions 4.84 or 5.05.
My questions are:
1. Can I we downgrade the OFW which is higher than 5.05 as like 6.7 or not ?!
2. Can PS3 games run on be PS4 jailbreak ?! I mean convert games and compress them into pkg and then install them on PS4 ?! Or not possible ?!
3-Can by PS4 jailbreak download all games from the store to ps for free ?!
4. Does PS4 jailbreak can play online ?!

Thank you