Is your phone unlocked?ohhh thanks i didin't know that, and what i download from there i have to flash it via fastboot? thanks for the response i'm new and i'm learning.
Currently Which rom ?
Delete all screen security.
Flash this recovery (twrp) https://androidfilehost.com/?fid=17248734326145679747
reboot to twrp
Go to wipe, format data yes, reboot twrp
Put the rom in internal storage with pc(or OTg)
Flash rom in twrp
First boot take 5/6 minutes