trying to unlock the bootloader, but fastboot doesn't recognize the device

running windows 10

adb recognizes the phone when it's booted up. so i type in cmd "adb reboot bootloader", then the LED lights up blue, which means it's currently in bootloader mode right? so i type in cmd "fastboot devices" but nothing happens. no devices are listed.

any advice? a bit desperate right now. thanks in advance!

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