@brendancheungcp You are running very old firmware from around the time of release. Bypass charging was added in September, which is why you can't find it.
Since you're not getting FOTA updates, I suspect you might have a Tencent device intended for the Chinese market, that has been flashed/rooted by your reseller. If this is the case, please contact your reseller, as this is not a configuration that we are selling. We can't guarantee it will function properly and you will not receive FOTA updates as the model and ROM does not match.
See this thread for more information:
https://zentalk.asus.com/en/discussion/44774/psa-tencent-branded-rog-phone-3-with-global-internation...