Can all RFID tags be rewritten or reprogrammed?

No—rewritability depends entirely on the tag’s memory architecture. RFID tags fall into three categories:

Read-Only (RO): Factory-programmed, immutable UIDs (common in anti-counterfeiting)
Write-Once-Read-Many (WORM): Allows one-time encoding after manufacturing
Read/Write (RW): Fully rewritable, supporting thousands of update cycles

Over 68% of industrial RFID tags sold today are RW-type for lifecycle tracking.

Rewritable tags partition memory into:

Key limitation: UIDs in Reserved Banks are rarely rewritable—physical replacement needed for ID changes.

Cykeo’s RW tags cut hospital asset-tagging costs by 92% vs. single-use tags.

Unauthorized Rewriting: Password-protect writers to prevent data tampering
Write Fatigue: EEPROM memory degrades after ~100,000 cycles
Frequency Mismatch: Ensure reader supports tag’s RF band (e.g., 902-928 MHz UHF)

Feature	Rewritable RFID	Non-Rewritable RFID
Memory Type	EEPROM/FRAM	ROM/PROM
Cost	Higher upfront (0.20–1)	Lower (0.05–0.20)
Lifespan	5–10 years	Single-use or permanent
Environmental Durability	✓ Withstands rewrites in harsh settings	✘ Often disposable

Tag Selection: Choose high-endurance tags (e.g., FRAM-based)
Software Setup: Connect writer to Cykeo TagSync software
Access Control: Enter encryption password
Field Rewriting:
- Select target memory bank (EPC/User)
- Enter new data (text/hex values)
- Apply cyclic redundancy check (CRC)
Verification: Scan tag to confirm updates

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