The Xiaomi 12 Pro running HyperOS presents a unique challenge for users wanting to utilize Line's messaging and call features. As rooting is not an option with HyperOS, there are limited ways to ensure reliable notifications.

One popular solution is FCMFix, an app designed to bypass Firebase Cloud Messaging limitations on certain devices. While FCMFix has proven effective for numerous users, some users, particularly those running HyperOS, have reported inconsistencies with notification reception when enabling '全选包含FCM应用' (Select All Containing FCM Applications) in the app settings.

Interestingly, users have noted that disabling this feature allows for timely message and call notifications. This begs the question: is there a conflict between FCMFix's functionality and the HyperOS environment when '全选包含FCM应用' is enabled? Further investigation is needed to understand why enabling this option seems to negatively impact notification reception in this specific scenario. If you're experiencing similar issues, consider disabling '全选包含FCM应用' in FCMFix as a temporary workaround while awaiting a potential solution from the developer.

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