Hello @Kavi, Welcome to the /e/ users forum.
just a thing i have to correct in the guide :
don’t pay attention when you see the advise that said :
“do not reboot into the system” or “do not reboot into /e/OS”,
instead of that, let the device reboot
and every time the device reboot to system,
you have to go through the setup wizzard,
re-enable “Developper Options”,
and re-enable “USB degugging” and “allow OEM Unlock”
good luck, let me know how it goes…