install the latest stable eu rom A11
the firmware will updated.
download lineageos for lmi latest build rom zip, and also the lineage recovery img from the lineage website.
you need adb installed and fastboot
(use search option to find files that you need.)
put the los rom zip file + los recovery img + fox orange recovery img + magisk zip file + Gapps zip file into the adb fastboot folder.
now you need to put your poco f2 into fastboot
connect it to your pc
and execute cmd from your adb folder.
and execute :
fastboot boot recovery name_los_recovery. img
rename the los recovery img to make thing easier
your phone will be booted into los recovery.
do factory reset and format system then go to apply update from adb sideload.
from you cmd window : adb sideload rom. zip
sideload the gapps zip and magisk with the same command and look at your phone screen you need to confirm the installation.