I searched the whole internet and couldn't find any guide for unlocking the bootloader of this specific model. my main goal is to install Lineage OS but the instructions on the page don't seem to be for this device.
Page Link: https://lineageosroms.com/ms013g/
(can't find a way to make fastboot find my device - it seems grand 2 doesn't have an actual fastboot mode. it has a download mode).
It says you need to enable OEM in developer mode but there is no such an option available.
I've also found a TWRP for my device here: https://forum.xda-developers.com/t/twrp-v3-2-3-0-for-galaxy-grand-2-sm-g7102-unofficial-updated.3778414/page-2
do I need to unlock the bootloader to replace it with the recovery mode of device?