Samsung Galaxy S5 G900V klte international

I have a Samsung Galaxy G900V klte international. I bought 2. I have used installation instructions from here
the default instillation guide
1st error was a pit error. According to what I found is my boot loader was locked. I used tools listed here
Had success I tried so many ways to get E to install. Used adb sideload from twrp recovery installed from the XDA rooting source. Maybe Someone could explain what failed initially. I can follow any URL and guide. Maybe heimdall is my better option. I have service with 6.01 VZW firmware with boost so I’m good there. IDC about volte or IMS. My signal sucks here at home loc. This is for away comms. Thanks in advance.

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