Allow installation of unknown sources by navigating to Settings > Safety and Privacy > Install Apps from Unknown Sources. # Once the installation gets done, copy the OBB file of the game to Internal Storage/SD card > Android > OBB > com. dts. freefireth.
How do I manually install Free Fire?
Download and install the XAPK Installer from here. Open XAPK Installer and open the XAPK file of Garena Free Fire in the same app. Hit the install button, and the third-party installer will automatically install the game. Open the game and log in to play.