A: Modded APKs often contain code that modifies memory (for unlimited ammo). Antivirus hates that. Use only from trusted modding communities, and avoid any APK that asks for SMS or contact permissions.
A: No. Once you go offline mod, you disable updates. If you want a new version, you must find a new APK+OBB pair and reinstall fresh.
However, as the game ages and servers become less reliable, many players face a common problem:
