Huh ?
You do realise they run custom firmware, and are not like the newer generation iPhone/iPad that run iOS ?
Secondly, as "jailbreaking" is against the Apple EULA, it would be against PPRuNe terms and conditions to discuss such matters. I don't think anyone really wants to incur the wrath of the mods and a possible ban.
Google and you shall find more "appropriate" forums where such things are discussed.