Lg g3 download mode not showing up.

Hello. Am in Mali with an Lg G3 16GB. I looked for solution to my download mode not working but no one replied. My g3 is dead,Ihave never tried update or root or... but now it's completely dead and when I normal boot it,it shows just black screen (No lg logo or any error report),just the black lit screen. Can't flash 'coz download mode not coming. I tried many tools but...failure. As this seems not to be resolvable,is there anyone who has an update.zip backuped from similar phone for me as my lg can access recovery mode. I'll try to apply update with sd card. Or is there any way or repairing download mode with adb sideload?
As far as ]download mode is concerned when I try to access it drivers are installed but the screen keeps black and it displays Mtk65XX installed and adb android phone can be also seen. Please,need to be rescued. Am now without hope as there is no warranty anymore.