Problem & Solution
Getting locked out of your apartment building, office, or gate because you misplaced your primary key fob is both frustrating and costly. Traditional replacement services often charge exorbitant fees to duplicate standard 13.56MHz key tags. Furthermore, many older rewritable tags (Gen1 UID) require specialized hardware like Proxmark3 or ACR122U desktop writers, creating a steep technical learning curve and extra expense for everyday users.
The GEN2 CUID Android App MCT Modify UID Changeable Keyfob pack completely solves this headache. Built with Gen2 CUID chips, these tags allow direct writing to Sector 0 / Block 0 right from your NFC-enabled Android smartphone using the free Mifare Classic Tool (MCT) app. You no longer need external hardware or complex command-line software to duplicate your 1K S50 access tags.
By keeping a pack of these rugged keyfobs handy, you can instantly create reliable backups for family members, guests, or emergency spares in seconds. Priced at just $2.05 after a 50% discount, it is an empowering, budget-friendly DIY solution that puts access control back in your hands.
Who Is It For?
This product is ideal for tech-savvy homeowners, apartment tenants, landlords, property managers, and security DIYers who need quick, inexpensive key fob duplication. Anyone with an NFC-enabled Android phone who wants to back up 13.56MHz Mifare Classic 1K cards without investing in pricey card programmers will find these keyfobs indispensable.
Key Features
- GEN2 CUID Chip TechnologyAllows direct Block 0 UID modification directly through standard Android NFC smartphones without needing special backdoor command writers.
- MCT Mobile App CompatibilitySeamlessly program and clone tags on the go using the free Mifare Classic Tool (MCT) app available for Android.
- 13.56MHz ISO 14443A & 1k S50 StandardFully compatible with standard Mifare Classic door access control systems, parking gates, and intercoms.
- Durable ABS Keyfob EnclosureRugged, waterproof plastic casing built to withstand daily wear and tear on your key ring.
- Multi-Cycle Rewritable Block 0Supports thousands of rewrite operations, allowing you to re-assign or update access credentials whenever needed.
- 5/10-Piece Bulk Value PackProvides extra spare tags at a fraction of the cost of commercial duplication services.
Pros & Cons
Pros
- Rewritable directly from an Android smartphone using the free MCT app
- No expensive ACR122U or Proxmark hardware required
- Unbeatable value at 50% off with strong performance history (2,900+ sold)
- Compact, water-resistant, and durable key fob form factor
Cons
- Requires an NFC-enabled Android phone (iOS devices cannot write UID/Block 0 due to Apple system restrictions)
- Not compatible with 125kHz low-frequency tags or high-security encrypted systems like HID iCLASS
FAQ
Gen1 UID tags require special backdoor commands and dedicated USB reader/writers to change Block 0. Gen2 CUID tags use standard write commands, allowing you to rewrite Block 0 directly using an Android smartphone and the MCT app.
No. Apple restricts low-level NFC access on iOS devices. Programming requires an NFC-enabled Android smartphone running the Mifare Classic Tool (MCT) app.
They work with 13.56MHz ISO14443A Mifare Classic 1K S50 systems. They will not work with 125kHz systems (EM4100) or advanced encrypted cards like Mifare DESFire or HID.
Gen2 CUID chips support thousands of re-write cycles, allowing you to re-program the UID and block data whenever necessary.
Final Verdict
The GEN2 CUID Android App MCT Modify UID Changeable Keyfob pack is an exceptional utility for anyone dealing with 13.56MHz access control systems. By eliminating the need for bulky hardware readers and letting users rewrite Block 0 straight from an Android phone, it offers modern convenience at an incredibly low price point. Backed by nearly 3,000 sales and a 91.3% positive feedback score, this heavily discounted set is a must-have tool for smart home enthusiasts and property managers alike.