Since you mentioned the domain ff-advance.ff.garena.com , please remember that this site is specifically for the Advance Server . The features tested there (like Booyah Day) are beta versions released so players can find bugs before the update is pushed to the global live servers. Activation codes for this server are usually limited and issued during the registration period.
A major quality-of-life update that allowed players to heal while moving, reducing vulnerability during intense firefights. ff-advance.ff.garena.com ob42
The OB42 patch was one of Garena's most significant updates, introducing mechanics that fundamentally changed the "meta" for competitive play. Since you mentioned the domain ff-advance