Go to Settings > Accounts > Google > Account sync > Enable Contacts manually. If missing, install “Google Contacts Sync” APK (version 10 or higher) separately.
Although safe, it is wise to back up important data.
Open your file manager, locate the downloaded APK, and install it. Launch the application. You will see a minimalist interface, usually featuring a large blue or red button (often labeled "Install" or written in Chinese characters). Tap this button to initiate the automated sequence. Step 3: Sequential Installation of Components
