Since Android 4.2.2 is (last security update 2015):
The "Official Gapps For Android 4.2.2" flashable zip represents a critical component of the Android modding history. It utilizes the Edify update system to modify the read-only system partition, integrating proprietary Google services into the open-source Android environment. Understanding the structure of these packages is essential for Android system developers and archivists maintaining legacy devices. Official Gapps For Android 4.2.2 Jellybean Flashable.zip
After boot, sign in to your Google account. If the Setup Wizard crashes, skip and add account later via Settings → Accounts. Since Android 4
: Power off your device, then hold the Power + Volume Down (or Up, depending on the model) buttons. After boot, sign in to your Google account
The flashable.zip file is a standard compressed archive adhering to the Edify update format. It must be signed (usually with a test key) to be accepted by the recovery environment.