I still can't fin any G4 model in the WRTP Tool app! Wonder wy...got it from playstore!
I found a way to install the recovery even if it doesn't appear on the app list:
just usae fastboot, thne install->choose "image" instead of zip" and here youare!
But now I'm in BIG troubles since I formatted the phone I system partition, that means that phone doesn't have an OS it just stop at boot logo!
Ok I found that all thw rold need the first stock rom from LG G4 in KDZ format to flash with LG Flash tool (a sort ot tar.md with odin in samsung method).
So if somebody find one pls add to first post.
Thank you!