The Android 6.0.1 update remains the final official major operating system upgrade for the ZenFone Selfie. Repacked versions are typically used by the community to provide a "cleaner" experience or to facilitate flashing via custom recovery (like TWRP) for users with unlocked bootloaders. Key Performance & Features Performance Stability

Storage Management: Because App2SD is unsupported, the internal storage (typically 16GB or 32GB) can fill up quickly unless you use the Android 6 feature to adopt SD card memory .

Warranty: Flashing custom firmware may void your device's warranty.

The phone may automatically detect the update. If not, boot into recovery mode (Power + Volume Down) and select "Apply update from SD card" Fastboot / Flash Tool (PC) Some repacks are provided as raw files that require the Asus Flash Tool or fastboot commands via PC.

Preparation:

A repackaged firmware, also known as a "repack," is a modified version of the original firmware that has been re-compiled and re-packaged to fix specific issues or add new features. Repackages are often created by third-party developers or enthusiasts who aim to improve the user experience or address problems that were not resolved by the original firmware release.