CODEWITHSUNDEEP
authenticationnfcrfidmifarecontactless-smartcard
Nicolas
Nicolas

Reputation: 1

Can't write on NFC Tag after reading with Google's web NFC sample

I have a NFC Tag Mifare Classic 1k which I was using with NFC Tools for android, and stopped being able to write after reading with web NFC sample (see: https://googlechrome.github.io/samples/web-nfc/).

After troubleshoothing and trying to format with MiFare Classic Tool the app shows this error with all blocks:

Key with write access (B) not known

This is the dump file:

+Sector: 0
9C441114DD0804000330A941C9310E1D
140103E103E103E103E103E103E103E1
03E103E103E103E103E103E103E103E1
A0A1A2A3A4A5787788C1FFFFFFFFFFFF
+Sector: 1
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 2
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 3
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 4
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 5
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 6
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 7
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 8
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 9
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 10
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 11
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 12
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 13
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 14
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF
+Sector: 15
00000000000000000000000000000000
00000000000000000000000000000000
00000000000000000000000000000000
D3F7D3F7D3F77F078840FFFFFFFFFFFF

I'm new to NFC and I'm not sure if it's corrupted or what happened and I don't make the same mistake.

I appreciate any kind of help.

Thank you!

Upvotes: 0

Views: 1199

Answers (1)

Andrew
Andrew

Reputation: 10232

It looks like it has been formatted in the proprietary way to store NDEF data as per the doc https://www.nxp.com/docs/en/application-note/AN1305.pdf

Which implementations of Web NFC might optionally support (as the web NFC standard allows support of non NFC Forum standard formats).

I don't think it is corrupted but not all hardware and software supports this proprietary Tag configuration.

I would try using the TagInfo and TagWriter Apps by NXP as these are written by the makers of the Tag and TagWriter has a factory reset erase method.

Upvotes: 2

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