bro tell us first what phone you want to unlock or perform firmware operation,as you mentioned you are 10 years old in this forum,different phone has different methods to connect to pc.
if old qualcomm vol up+vol down
if new qualcomm check testpoint and connect
some mtk models vivo,oppo,huawe or any just connect
some mtk oppo vivo vol+vol down connet meta mode
if spd just connect
tell which model you want to perform what job.so there are lot of people who can help you
