Finally rooted!! Every time you feel you got there and now just have to jump and grab… NOO… It won’t work! Something has to be changed! 
Great box! Loved it because this box teaches you to look at every aspect. As @GibParadox said in page 9, attention to detail is crucial!
Though had a weird problem on reverse shell for root! Could not figure out why!
Thanks @EvilT0r13 and @murderfalcon. Thanks to the makers…
Feel free to PM if need help!