I want to thank everyone here! Finally all is done! So from my turn,i will give instructions on what i did,so if any newbie like me get here,he can made it like i did.So i firstly downloaded the latest fw on my kindle SD and i updated.Then i made a factory reset (optional) Then i registered the kindle.Then i just followed the instructions on the fantastic and detailed winder break web page.(Also disabled OTA) Then to my surprise,i couldn't install Koreader.Then i saw a video on youtube and i saw that since latest jailbreak/firmware,we have to install nightly Koreader.Then i followed instructions of this video and i finally installed koreader(process is much easier,because now we just paste the 2 extracted folders to the root of kindle SD.(logically now we wait a stable Koreader release for new jailbreak/firmware versions) To my surprise i also noticed faster pages turn.And maybe bit snapier overal system.Lets hope battery life also has been increased! Again thanks to all of you guys!
https://youtu.be/ovAMYkgL1E0