tips how to repair lg g4 bootloop isue at home
(1) shut down your phone for atleat 5 minets
(2) after 5 minets open phone back cover pull out the battery
(3) take an hair dryer and power on it  put hair dryer heat under the camera potion
(4) dont turn on your phone imediately
(5) open itr after 60- seconds and your lg device will turn on
i have do this many time on my lg g4