Hi Billy, I am sorry to have caused you offense. I guess I was jumping to the conclusion that your friend had the device and you had sight of it to be able to tell us about OEM unlock.
Then my mistake was to think that …
… you were considering working with him on his phone like this! 
My sincere apologies … still the wider subject exists … there is little work that seems to have been done on this device, even the possibility of GSI is an unknown at this stage.
I was imagining that you were hopeful of learning “how to GSI” from what you said in Post #3, TrebleInfo is the very first thing to do in that workflow.
Another wrong assumption on my part … sorry.