p505 won't root after updating official firmware

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http://forum.xda-developers.com – I had a problem flashing a rom a few days ago and got stuck in fast boot mode so I restored my phone with the newest official update from LG V20f. Now I am unable to get it rooted. I have read and tried several different guides on super one click and the process always stalls on step 7 with "waiting for device." Is there a new method for rooting this update I need to use? I originally rooted using that old apk before the phones were patched to disable it. I know people say to do searches before asking questions like this but I have been and I am honestly stuck. (HowTos)