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Format memoryRe-initialize the NDEF container.Native app only
Lock tagPermanently write-protect the chip.Native app only
Set / remove passwordNTAG21x password protection.Native app only
Advanced NFC commandsRaw chip-level operations.Native app only
Format, lock and password operations are outside the Web NFC standard — use a native utility such as NFC Tools (Android/iOS) for those. Tags written here stay fully compatible.
