A: No. QR codes are for sharing profiles or redeeming official event codes — never for adding currency. Any QR code claiming to give diamonds is a scam.
Many videos showing “Free Fire hack QR code working” are using:
The most effective way to unlock weapon skins, characters, and emotes for free is through official redeem codes. These are alphanumeric codes released by Garena during events. Abuse Policy - Garena Free Fire
A very common variant: after scanning, you’re told to complete a “human verification” survey or enter a password found in a YouTube video description. These generate affiliate money for scammers. There is — just wasted time and exposed personal data.