PC Suite gave me a lot of problems. It initially worked on my windows machine, but a reformat of that one and I can't install PC Suite on it anymore. Keeps giving me an NSIS error. PC Suite installed fine on my Macbooks but it won't detect the phone. grr
what worked for me was downloading the drivers and the LG Mobile Support Tool (do a search)
this won't let you sync stuff, but it will let you update your phone to the latest available software. For me, it turned out to be version g.
Purple drake root worked after this, and all software and most settings unchanged. Had to turn on xposed again though, and experimental settings with greenify to get everything just like it was before the upgrade.