Unfortunately I make a mistake by modifying the core directory -_-" ,is there any solution to recover the original configuration of core directory ?
if you have 7zip you can download the .IMG from the forums and open it. once you have it open open the 1.img from inside it and you have the full filesystem. you need to locate the core directory but its there. copy it over using SCP or the SMP and moving via ssh, but that should do for a fix. if you need actual step by step message me.