
I THINK I FOUND THE SOLUTION TO UNLOCKING 60 FPS CAP TO 120 FPS, PLEASE READ CAREFULLY
So first of all, i want to specifically say that this is a solution i've come up for those who have HyperOS 3 but their game is capped to 60 fps only.
Now i don't know if this will work for all of those who have Hyper OS 3 that is encountering the same problem but i hope this helps.
So when i'm experimenting stuff, i've come across this in Settings -> Battery there you should see all apps below if you scroll down, but when i clicked on Call of Duty Mobile it was on "Battery saver mode" so i've changed it to "No restriction" and after that i go to Apps i cleared data "Battery & Performance" my Call of Duty Mobile went from 60 fps only to 120 fps(note that before i tested this method my CODM was hard stuck on 60 fps only it was damn laggy) but after i did this thing on the settings i've noticed that it started running Call of Duty Mobile 120 fps permanent i even back it to home screen and re-enter the app just to be sure if it was really permanent or just temporary but surprisingly it stayed at 120 fps after that i even closed the app on recents and it stayed at 120 fps, now on theory i think this is what is limiting our games to only cap at 60 fps, so i recommend to put the settings on "No restriction" if you want to unlock 120 fps permanently, now note that i also don't know if this will work on you but it worked on mine, no need to uninstall, no need to disable any settings or even touch developer's option.