To check for the update manually, head to Settings.
Asus ZenFone Max M2 has started receiving an update that brings along the May 2019 Android security patch. The update is rolling out via OTA, and it comes with firmware version 16.2018.1905.42. Asus notes that it may take some days for all users to get the FOTA notice. We recommend all users to update their phones as soon as they receive it as security patches come with critical bug fixes and performance improvements. The Asus ZenFone Max M2 users in India got the Android Pie update last month.
Asus shared the changelog on its forums, and says that the firmware update number 16.2018.1905.42 brings the May 2019 Android security patch to the Asus ZenFone Max M2. The release notes suggest that the Android 9.0 Pie-based update also upgrades Google Mobile Services (GMS) to version 9.0_201903. Apart from that and the May 2019 security patch, the update brings little else. To check for the update manually, head to Settings > System > System Updates.
