Greetings, I am noob too, but I am learning. I cannot answer your question about unlocking the bootloader, however, someone gave me an Alcatel Verso that had frp lock screen. Got limited access and installed an app called quickshortcutmaker. This allows running all the activities. There is a system app on mine called engineer mode. This reveals the actual file system as well as other info.
It appears there is not a reboot bootloader mode, it does have reboot recovery, but also I do not think it has fastmode. There is another mode called download mode, but I have not successfully used this for anything. Also, connecting usb abd in recovery mode yields device unauthorized.
If you are interested, I'll explain how I got frp partially bypassed. Added emergency contact, added an email, a prompt came up asking me which service to use, there were like four options like google, etc. I chose one I had not heard of that had the word executive, because it sounded official. When I chose it, another prompt came up saying that in order to use this service I had to set up a lock screen, make sure func is enabled. When I then turned the screen off and back on, I had a google search option from the lock screen. Pressed it and said "open settings", enabled install of unknown sources, used google search and said "open chrome". Used chrome to download quickshortcutmaker. Used google search and said "open file manager". Used file manager to install quickshortcutmaker. At this point I could have just used the phone from there, however... I added quickshortcutmaker to the func lock screen list by using google search to open settings. Then from the lock screen, I could launch quickshortcutmaker (or use google search). I then used quickshortcutmaker to run 'joy launcher' and voila, in. However, only the back button worked, and if I tried to log into google, it would bring up the frp lock screen. So, using the quickshortcutmaker, I ran every activity on the phone, and using the engineermode system app (I am pretty sure it was that one) I toggled an option called 'demo mode'. Upon exiting this system app and pressing the square button next to the home and back button, I saw an option to accept user agreement, or something like that. I scrolled down and checked the box, and voila, frp lock totally gone, and now I can log into google.
Now I am trying to root, but first I must unlock the bootloader.