So I have tried to jailbreak my kindle pp3 but didn't go as expected
I have opened the front panel (be sure you have the right tools otherwhise you risk to damage your kindle, don't use cheep opening tools)
The problem is, I have destroyed the firmware connectors (rx-tx), I have used an electronic soldering gun and after I have melted the cables on connectors the cables depleted with the connectors on them
(so no more jailbreak for my kindle, don't use an electronic soldering gun but use some plasteline and carefully somehow attach the cables on the connectors, also you won't be able to melt anything on the voltage conector because is unstickable!)