4-Byte UID Changeable 4K S70 Magic Card (MIFARE® Compatible)

SKU: MT-S70-4B Categories: RFID Cards & Magic Tags, White Card
Brand: MTools Tec

Original price was: $5.99.Current price is: $4.79.

Gen3 S70 4K magic card with a rewritable 4-byte UID (8 hexadecimal digits). Now supported by Flipper Zero with MTools.

Also works with supported PN532 / PN532Killer, Proxmark3, ACR122U and iCopy-XS tools. Built-in phone NFC cannot directly change the UID.

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GEN3 MAGIC CARD · S70 4K · 4-BYTE UID

4K memory. Rewritable 4-byte UID.
Now supported by Flipper Zero.

A MIFARE Classic-compatible S70 4K magic card with a changeable 4-byte UID. Use Flipper Zero with MTools, PN532 / PN532Killer, or Proxmark3 for supported Gen3 workflows.

4-byte UID | S70 4K | Gen3 / APDU

The supplied screenshots show this 4-byte model detected by MTools, plus UID changes with PN532Killer and Proxmark3.

Choose your reader

Use a reader and software combination that supports Gen3 magic cards.

All-in-one PN532

USB with PN532 CLI, or a compatible Bluetooth connection with MTools BLE.

Proxmark3 X

Inspect the card and change its 4-byte UID with Gen3 commands.

Proxmark3 RDV4.01

HF card inspection and supported Gen3 UID operations.

Flipper Zero

Install MTools for Flipper Zero for supported Gen3 magic-card tools.

Supported by Flipper Zero with MTools

Use the MTools app for Flipper Zero with this 4-byte S70 4K card to access supported Gen3 magic-card functions.

The supplied Magic Check screenshot shows MFC 4K / 4B, UID 11223344, SAK 18, ATQA 0200 and MFC GEN3 – APDU detection.

This screen confirms identification and capability detection. After changing the UID, read the card again to verify the saved value.

MTools for Flipper Zero →

View Flipper Zero →

UID change verified with PN532Killer

The supplied PN532 CLI session scans UID AABBCCDD, detects a Gen3 tag and successfully writes 11223344. A second scan confirms the new UID.

hf 14a scan
hf mf setuid -u 11223344 -g 3
hf 14a scan

The -g 3 option selects Gen3. A 4-byte UID contains 8 hexadecimal digits.

Use PN532 CLI with All-in-one PN532 or PN532Killer and compatible firmware.

Get PN532 CLI →

Inspect and rewrite with Proxmark3

The supplied output shows UID 11 22 33 44, SAK 18 and Gen 3 / APDU (possibly) magic capabilities. The subsequent Gen3 UID command reports the new UID as AA BB CC DD.

hf mf info
hf mf gen3uid -u AABBCCDD

Use Proxmark3 X or Proxmark3 RDV4.01 with a compatible client and firmware. Read the card again after writing to confirm the result.

More ways to work with the card

By MTools BLE App

Use the UID Changer in MTools BLE with a supported external Bluetooth reader to change the UID of compatible Gen3 magic cards.

Supported devices:

Choose the Gen3 UID-changing function and enter the UID length required by your card. Read the card again after writing to verify the saved UID.

UID Changer is a paid feature of MTools BLE. Supported operations depend on the reader firmware and app version.

Download MTools BLE from the Play Store or App Store.

PN532 Bluetooth setup guide →

ACR122U and iCopy-XS

ACR122U can be used with PCSC_Mifare_Secure for Windows. iCopy-XS supports this card with compatible Gen3 tools.

Read, write, then verify

Identify the card with your supported reader and back up any data you need.
Use the Gen3 workflow and a 4-byte UID, such as 11223344.
Read the card again to confirm the saved UID and required data.

Phone NFC: built-in Android and iOS NFC cannot directly change this UID. Mobile UID changes require a compatible external reader.

PCR532: can read and write card data, but cannot change this Gen3 UID.

Choose the right UID length: this is the 4-byte S70 4K model. For a 7-byte UID, see the 7-byte S70 4K card. Reader compatibility also depends on card data and application requirements.

Trademark notice: MIFARE®, MIFARE Classic®, MIFARE Ultralight®, and MIFARE DESFire® are registered trademarks of NXP B.V. This compatible product is not manufactured, sponsored, endorsed, or authorized by NXP B.V. Trademark references are used solely to identify product compatibility.

Weight	0.1 kg

Specifications

UID Changeable	Yes (Backdoor Command)
Working Temperature	-20°C-70°C
Protocol	ISO14443A
UID Length	4 Bytes
Memory	4KB
Device Support	ACR122U, iCopy-XS, PN532, Proxmark3 X, Chameleon Ultra, Proxmark3 RDV4

Software

Android App	MTools BLE
iOS App	MTools BLE

Weight	0.1 kg
UID Changeable	Yes (Backdoor Command)
Working Temperature	-20°C-70°C
Protocol	ISO14443A
UID Length	4 Bytes
Memory	4KB
Android App	MTools BLE
iOS App	MTools BLE
Device Support	ACR122U, iCopy-XS, PN532, Proxmark3 X, Chameleon Ultra, Proxmark3 RDV4

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4-Byte UID Changeable 4K S70 Magic Card (MIFARE® Compatible)

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Q & A

Ask a question

Does it support changing the ATS? Artur Andre asked on May 6, 2024

Hi Artur,
The S70 magic card does not support changing the ATS, the Gen4 Ultimate Magic card supports that.

admin answered on May 8, 2024 store manager

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