mifare classic 1k tag reads fine but write fails

[akash gill]

Hi,

I am trying to make an app that reads the data from Mifare classic 1k tag, modifies it and writes it back to tag. 

My reader is ACR 122 and I have taken the latest code from repository.

Read works perfectly fine. Two problems afterwards

1. The tag shows up as non-writable on first touch. On second touch it shows writable.

2. On second touch when it becomes writable then I get this error while writing data: org.nfctools.mf.MfLoginException: Login failed. Sector: 1, Block: 0 Key: B, Response: SW1: 99 SW2: 0.

Regards

Akash

[Fermín Teuctzintli Vázquez Pérez]

Me too

[Ashish Kasodariya]

On Wednesday, August 14, 2013 2:33:53 AM UTC+5:30, Fermín Teuctzintli Vázquez Pérez wrote:

Me too

El viernes, 7 de junio de 2013 15:55:18 UTC-5, akash gill escribió:

Hi,

I am trying to make an app that reads the data from Mifare classic 1k tag,  but my problem is once tag is write it make read only then it access to give read write and others to give read only protection plz help me

[Giosk]

Could you please post your code?

I'm asking this because I can't read my Mifare classic 1k tag and I don't know why.

The error is this:

Exception in thread "Thread-1" java.lang.RuntimeException: org.nfctools.ndef.NdefException: unknown service type

at org.nfctools.spi.acs.PollingCardScanner.run(PollingCardScanner.java:51)

at java.lang.Thread.run(Unknown Source)

Caused by: org.nfctools.ndef.NdefException: unknown service type

at org.nfctools.mf.ndef.MfNdefReader.readNdefMessage(MfNdefReader.java:60)

at org.nfctools.examples.ndefreader.NdefReaderDemo.cardDetected(NdefReaderDemo.java:52)

at org.nfctools.spi.acs.PollingCardScanner.waitForCard(PollingCardScanner.java:61)

at org.nfctools.spi.acs.PollingCardScanner.run(PollingCardScanner.java:45)

... 1 more

Do you have any idea? 

Thanks

Giosk

[Hanna N]

Have you ever solve this problem?