Help for rooting HTC Evo 3d

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Hello, i have htc evo 3d, unlocked, S-on, HBOOT 1.49.0018, KingCobra Rom (i put i t because my phone won't start - just freeze on startup HTC Screen). I'm not sure i did everything right, because now Wireless says "error", and my mobile internet is not stable. I'm not sure that i rooted my phone correctly, somewhere i read first i should downgrade Hboot, and i tried but no effect it's still 0018. I will appreciate if u can suggest me how to make everything on my HTC work.
sorry for my bad engish, hope it's understandable.
Thank you in advance.

p.s. i tried almost everything, unlock root and htc supertool v3 too