Em what I confirmed is after laf killed, volume up will definitely bring the phone into fastboot.Have you tried multiple times? Sometimes I find it really tricky because I'm already pressing volume down in order to force reboot.
When already connected to your PC, hold vol - and power button in order to force the reboot, and as soon as the screen goes off press only vol -. It should work in this way.
Inviato dal mio LM-G710 utilizzando Tapatalk
---------- Post added at 03:48 PM ---------- Previous post was at 03:47 PM ----------
Doesn't work for me but I solved the problem with another way. Thank you kindly.Unplug your USB cable, turn your phone off and wait 15 seconds. Hold volume down (-) and keep it down while you insert the cable.