# How to use UID Changer

### Supported Readers

1. [PN532 BLE](https://shop.mtoolstec.com/product/mtools-all-in-one-pn532) or [PCR532](https://shop.mtoolstec.com/product/pcr532)
2. [ChameleonUltra](https://shop.mtoolstec.com/product/chameleon-ultra)

### Supported Magic Cards

#### Gen1A

* [Mifare S50 with 4 Byte UID](https://shop.mtoolstec.com/product/uid-changeable-nfc-mifare-s50-keychain)

#### Gen2

* [Mifare S50 with 4 Byte UID](https://shop.mtoolstec.com/product/uid-changeable-1k-s50-chinese-magic-card?attribute_pa_card-type=cuid\&attribute_pa_amount=1-pc)

#### Gen3

* [Mifare S70 with 7 Byte UID](https://shop.mtoolstec.com/product/7-byte-uid-s70-4k-magic-key-fob)
* [Mifare S70 with 4 Byte UID](https://shop.mtoolstec.com/product/4-byte-uid-s70-4k-magic-key-fob)
* [Mifare S50 with 7 Byte UID](https://shop.mtoolstec.com/product/7-byte-uid-s50-1k-magic-key-fob)
* [Mifare S20 with 7 Byte UID](https://shop.mtoolstec.com/product/7-byte-uid-changeable-mifare-mini-s20-card)
* [Mifare S20 with 4 Byte UID](https://shop.mtoolstec.com/product/4-byte-uid-changeable-mifare-mini-card)

#### Gen4

* [Ultimate Magic Card](https://shop.mtoolstec.com/product/ultimate-magic-card-gen4)

### Card Type Selection

<figure><img src="/files/v83JRg7sfhxTnP5nmWk7" alt=""><figcaption></figcaption></figure>

### Configuration

<figure><img src="/files/AdxbxvLzIdJQo6ZuK9Mj" alt=""><figcaption></figcaption></figure>

### How to change

1. Input the valid information.
2. Click **Execute** to change the UID.


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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.mtoolstec.com/how-to-use-uid-changer.md?ask=<question>
```

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The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.