can't install recovery

Hello guys I got lg g2 d800 and I can't install twrp I'm running stock 5.0.2. I have tried every method that I possibly could but still nothing.I install auto rec but it won't go any further than its boot screen then I read that I have to have supersu v2.46 I install that using flashy zip and apk but fails worst is that I lost stock recovery.
Any help would be appreciated:good:

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