Please help, can't get to download mode after rooting, want to unroot

[Hebaz]

I rooted my LG G2 last week with ioroot22 and now i want to unroot but can't get into download mode. I have searched the forums and have read about downloading files and booting into ubuntu or something but that is way over my head. Can someone please help me? I am just not able to get used to Android

 

[SactoKingsFan]

This guide should help.

VERIZON ONLY Revert to stock GUIDE [UPDATED] - xda-developers