unable to go into fastboot on LG phone
I found the answer. It is not possible because of the hardware itself. LG sucks really. Here is the info from their developers site which explains all the difficulty (LG K8 not listed below :():

"The following devices support unlocking the bootloader:
• LG V50: LMV500EM for the European market 
• LG V40: LMV405EBW for the European market 
• LG G7: LMG710EM for the European market 
• LG V30: H930 and H930G for the European market
• LG G6: US997.USA for the U.S. open market
• LG G6: H870 for the European market
• LG V20: US996.USA for the U.S. open market
• LG V10: H960A for the European market and Android M (Except France)
• LG G5 SE: H840 for the European market
• LG G5: RS988.USA for the U.S. open market
• LG G5: H850 for the European market
• LG G4: H815 for the European market
Unlocking the Bootloader is only supported on selected devices."


The lesson learned here: verify the capabilities of the phone you want to buy before wasting your money.