I'm trying to root my T-Mobile LG G2 with stock 4.4.2, but the it just refuses to enter download mode. I've tried the standard method of entering download mode (powering down the phone, holding down the volume button, plugging in the USB cable from my computer), but only the LG logo appears on screen, then the battery percentage appears on screen, and then the phone begins to charge. I've tried using different USB cables and different PCs, but nothing seems to work.
Is there anything I'm doing wrong here? Any extra steps that need to be taken?
Any help would be greatly appreciated!