NFC microchip Read only unlock

What do the photos mean?
Same for other apps
Cannot write.

Is this error returned when you try to read memory from your chip?

The end of my read is this(there’s roughly 65recods between where your’s stops and mine):

[ 00:00:00:00 ] Addr. DF : DATA
[ 00:00:00:00 ] Addr. E0 : DATA
[ 4E:45:78:54 ] Addr. E1 : DATA
[ 00:00:7F:BD ] Addr. E2 : LOCK2 - LOCK4
[ 04:00:00:E3 ] Addr. E3 : CFG 0 (MIRROR / AUTH0)
[ 00:05:00:00 ] Addr. E4 : CFG 1 (ACCESS)
[ 00:00:00:00 ] Addr. E5 : PWD0 - PWD3
[ 00:00:00:00 ] Addr. E6 : PACK0 - PACK1
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No. Displayed when writing.

You may have checked the Lock Tag in the photo above.

If checked, can I unlock?

can you try these apps and let us know your results
Tag Writer
Tag Info
NFC Tools
NFC Tools Pro

Don’t check the lock option. As it states, it’s permanent and you won’t be able to change it in future.

No, that’s why the warning is telling you you can’t unlock the tag if that is checked. You may be able to recover it with a Proxmark, but I can’t confirm that, you’d have to wait for someone else to chime in.

How did you get your tag readout that you posted here?
The readout you posted has an error at the bottom, which may be contributing to the issue. There’s Dynamic lock bytes stored in the last page or so of the chip that I’m not seeing in your dump.

Here’s a quote from one of Amal’s posts explaining this:

All apps are listed as read only.
Unlock by using Proxmark?

If checked, can I unlock?

I may have checked

The only way to tell for sure is another scan from TagInfo (dngr.us/taginfo)… try to get the full scan (no aborted error).

1 Like

If locked permanently, can other writing be done with the same tip?

FULL SCAN ------------------------------

Technologies supported:

ISO/IEC 14443-3 (Type A) compatible
ISO/IEC 14443-2 (Type A) compatible

Android technology information:

Tag description:

  • TAG: Tech [android.nfc.tech.NfcA, android.nfc.tech.MifareUltralight, android.nfc.tech.Ndef]
  • Maximum transceive length: 253 bytes
  • Default maximum transceive time-out: 618 ms

Detailed protocol information:

ID: 04:65:AF:12:FF:38:81
ATQA: 0x4400
SAK: 0x00

Memory content:

[00] * 04:65:AF 46 (UID0-UID2, BCC0)
[01] * 12:FF:38:81 (UID3-UID6)
[02] . 54 48 00 00 (BCC1, INT, LOCK0-LOCK1)
[03] . E1:10:6D:0F (OTP0-OTP3)
[04] . 03 1F D1 01 |…|
[05] . 1B 54 82 65 |.T.e|
[06] . 6E FF FE 30 |n…0|
[07] . 00 39 00 30 |.9.0|
[08] . 00 35 00 34 |.5.4|
[09] . 00 36 00 39 |.6.9|
[0A] . 00 35 00 33 |.5.3|
[0B] . 00 33 00 38 |.3.8|
[0C] . 00 FE 00 00 |…|
[0D] . 3D 6B 65 6E |=ken|
[0E] . 67 6F 25 32 |go%2|
[0F] . 30 73 68 69 |0shi|
[10] . 6E 64 61 26 |nda&|
[11] . 69 6E 70 75 |inpu|
[12] . 74 3D 74 65 |t=te|
[13] . 78 74 26 74 |xt&t|
[14] . 65 78 74 3D |ext=|
[15] . 30 39 30 35 |0905|
[16] . 34 36 39 35 |4695|
[17] . 33 33 38 11 |338.|
[18] . 01 1B 54 82 |…T.|
[19] . 65 6E FF FE |en…|
[1A] . 30 00 39 00 |0.9.|
[1B] . 30 00 35 00 |0.5.|
[1C] . 34 00 36 00 |4.6.|
[1D] . 39 00 35 00 |9.5.|
[1E] . 33 00 33 00 |3.3.|
[1F] . 38 00 51 01 |8.Q.|
[20] . 33 55 04 6C |3U.l|
[21] . 61 6B 65 73 |akes|
[22] . 69 64 65 6C |idel|
[23] . 6C 61 6D 61 |lama|
[24] . 2E 63 6F 6D |.com|
[25] . 2F 61 70 70 |/app|
[26] . 3F 68 6B 3D |?hk=|
[27] . 6B 65 6E 67 |keng|
[28] . 6F 25 32 30 |o%20|
[29] . 73 68 69 6E |shin|
[2A] . 64 61 25 32 |da%2|
[2B] . 30 31 39 39 |0199|
[2C] . 35 31 31 30 |5110|
[2D] . 39 FE 00 00 |9…|
[2E] . 00 00 00 00 |…|
[2F] . 00 00 00 00 |…|
[30] . 00 00 00 00 |…|
[31] . 00 00 00 00 |…|
[32] . 00 00 00 00 |…|
[33] . 00 00 00 00 |…|
[34] . 00 00 00 00 |…|
[35] . 00 00 00 00 |…|
[36] . 00 00 00 00 |…|
[37] . 00 00 00 00 |…|
[38] . 00 00 00 00 |…|
[39] . 00 00 00 00 |…|
[3A] . 00 00 00 00 |…|
[3B] . 00 00 00 00 |…|
[3C] . 00 00 00 00 |…|
[3D] . 00 00 00 00 |…|
[3E] . 00 00 00 00 |…|
[3F] . 00 00 00 00 |…|
[40] . 00 00 00 00 |…|
[41] . 00 00 00 00 |…|
[42] . 00 00 00 00 |…|
[43] . 00 00 00 00 |…|
[44] . 00 00 00 00 |…|
[45] . 00 00 00 00 |…|
[46] . 00 00 00 00 |…|
[47] . 00 00 00 00 |…|
[48] . 00 00 00 00 |…|
[49] . 00 00 00 00 |…|
[4A] . 00 00 00 00 |…|
[4B] . 00 00 00 00 |…|
[4C] . 00 00 00 00 |…|
[4D] . 00 00 00 00 |…|
[4E] . 00 00 00 00 |…|
[4F] . 00 00 00 00 |…|
[50] . 00 00 00 00 |…|
[51] . 00 00 00 00 |…|
[52] . 00 00 00 00 |…|
[53] . 00 00 00 00 |…|
[54] . 00 00 00 00 |…|
[55] . 00 00 00 00 |…|
[56] . 00 00 00 00 |…|
[57] . 00 00 00 00 |…|
[58] . 00 00 00 00 |…|
[59] . 00 00 00 00 |…|
[5A] . 00 00 00 00 |…|
[5B] . 00 00 00 00 |…|
[5C] . 00 00 00 00 |…|
[5D] . 00 00 00 00 |…|
[5E] . 00 00 00 00 |…|
[5F] . 00 00 00 00 |…|
[60] . 00 00 00 00 |…|
[61] . 00 00 00 00 |…|
[62] . 00 00 00 00 |…|
[63] . 00 00 00 00 |…|
[64] . 00 00 00 00 |…|
[65] . 00 00 00 00 |…|
[66] . 00 00 00 00 |…|
[67] . 00 00 00 00 |…|
[68] . 00 00 00 00 |…|
[69] . 00 00 00 00 |…|
[6A] . 00 00 00 00 |…|
[6B] . 00 00 00 00 |…|
[6C] . 00 00 00 00 |…|
[6D] . 00 00 00 00 |…|
[6E] . 00 00 00 00 |…|
[6F] . 00 00 00 00 |…|
[70] . 00 00 00 00 |…|
[71] . 00 00 00 00 |…|
[72] . 00 00 00 00 |…|
[73] . 00 00 00 00 |…|
[74] . 00 00 00 00 |…|
[75] . 00 00 00 00 |…|
[76] . 00 00 00 00 |…|
[77] . 00 00 00 00 |…|
[78] . 00 00 00 00 |…|
[79] . 00 00 00 00 |…|
[7A] . 00 00 00 00 |…|
[7B] . 00 00 00 00 |…|
[7C] . 00 00 00 00 |…|
[7D] . 00 00 00 00 |…|
[7E] . 00 00 00 00 |…|
[7F] . 00 00 00 00 |…|
[80] . 00 00 00 00 |…|
[81] . 00 00 00 00 |…|
[82] . 00 00 00 00 |…|
[83] . 00 00 00 00 |…|
[84] . 00 00 00 00 |…|
[85] . 00 00 00 00 |…|
[86] . 00 00 00 00 |…|
[87] . 00 00 00 00 |…|
[88] . 00 00 00 00 |…|
[89] . 00 00 00 00 |…|
[8A] . 00 00 00 00 |…|
[8B] . 00 00 00 00 |…|
[8C] . 00 00 00 00 |…|
[8D] . 00 00 00 00 |…|
[8E] . 00 00 00 00 |…|
[8F] . 00 00 00 00 |…|
[90] . 00 00 00 00 |…|
[91] . 00 00 00 00 |…|
[92] . 00 00 00 00 |…|
[93] . 00 00 00 00 |…|
[94] . 00 00 00 00 |…|
[95] . 00 00 00 00 |…|
[96] . 00 00 00 00 |…|
[97] . 00 00 00 00 |…|
[98] . 00 00 00 00 |…|
[99] . 00 00 00 00 |…|
[9A] . 00 00 00 00 |…|
[9B] . 00 00 00 00 |…|
[9C] . 00 00 00 00 |…|
[9D] . 00 00 00 00 |…|
[9E] . 00 00 00 00 |…|
[9F] . 00 00 00 00 |…|
[A0] . 00 00 00 00 |…|
[A1] . 00 00 00 00 |…|
[A2] . 00 00 00 00 |…|
[A3] . 00 00 00 00 |…|
[A4] . 00 00 00 00 |…|
[A5] . 00 00 00 00 |…|
[A6] . 00 00 00 00 |…|
[A7] . 00 00 00 00 |…|
[A8] . 00 00 00 00 |…|
[A9] . 00 00 00 00 |…|
[AA] . 00 00 00 00 |…|
[AB] . 00 00 00 00 |…|
[AC] . 00 00 00 00 |…|
[AD] . 00 00 00 00 |…|
[AE] . 00 00 00 00 |…|
[AF] . 00 00 00 00 |…|
[B0] . 00 00 00 00 |…|
[B1] . 00 00 00 00 |…|
[B2] . 00 00 00 00 |…|
[B3] . 00 00 00 00 |…|
[B4] . 00 00 00 00 |…|
[B5] . 00 00 00 00 |…|
[B6] . 00 00 00 00 |…|
[B7] . 00 00 00 00 |…|
[B8] . 00 00 00 00 |…|
[B9] . 00 00 00 00 |…|
[BA] . 00 00 00 00 |…|
[BB] . 00 00 00 00 |…|
[BC] . 00 00 00 00 |…|
[BD] . 00 00 00 00 |…|
[BE] . 00 00 00 00 |…|
[BF] . 00 00 00 00 |…|
[C0] . 00 00 00 00 |…|
[C1] . 00 00 00 00 |…|
[C2] . 00 00 00 00 |…|
[C3] . 00 00 00 00 |…|
[C4] . 00 00 00 00 |…|
[C5] . 00 00 00 00 |…|
[C6] . 00 00 00 00 |…|
[C7] . 00 00 00 00 |…|
[C8] . 00 00 00 00 |…|
[C9] . 00 00 00 00 |…|
[CA] . 00 00 00 00 |…|
[CB] . 00 00 00 00 |…|
[CC] . 00 00 00 00 |…|
[CD] . 00 00 00 00 |…|
[CE] . 00 00 00 00 |…|
[CF] . 00 00 00 00 |…|
[D0] . 00 00 00 00 |…|
[D1] . 00 00 00 00 |…|
[D2] . 00 00 00 00 |…|
[D3] . 00 00 00 00 |…|
[D4] . 00 00 00 00 |…|
[D5] . 00 00 00 00 |…|
[D6] . 00 00 00 00 |…|
[D7] . 00 00 00 00 |…|
[D8] . 00 00 00 00 |…|
[D9] . 00 00 00 00 |…|
[DA] . 00 00 00 00 |…|
[DB] . 00 00 00 00 |…|
[DC] . 00 00 00 00 |…|
[DD] . 00 00 00 00 |…|
[DE] . 00 00 00 00 |…|
[DF] . 00 00 00 00 |…|
[E0] . 00 00 00 00 |…|
[E1] . 00 00 00 00 |…|
[E2] . 00 00 00 BD (LOCK2-LOCK4, CHK)
[E3] . 04 00 00 FF (CFG, MIRROR, AUTH0)
[E4] . 00 05 – -- (ACCESS)
[E5] +P FF FF FF FF (PWD0-PWD3)
[E6] +P 00 00 – -- (PACK0-PACK1)

*:locked & blocked, x:locked,
+:blocked, .:un(b)locked, ?:unknown
r:readable (write-protected),
p:password protected, -:write-only
P:password protected write-only


This might be a silly question but is something you need to do to your NFC chip like first set up or can you just right away pull up your NFC tools app and write to it? Password or is there anything that no buddy can just use there tool app and write to my chip?

I did a scan.
Do you know the cause?

FULL SCAN ------------------------------

Technologies supported:

ISO/IEC 14443-3 (Type A) compatible
ISO/IEC 14443-2 (Type A) compatible

Android technology information:

Tag description:

  • TAG: Tech [android.nfc.tech.NfcA, android.nfc.tech.MifareUltralight, android.nfc.tech.Ndef]
  • Maximum transceive length: 253 bytes
  • Default maximum transceive time-out: 618 ms

Detailed protocol information:

ID: 04:65:AF:12:FF:38:81
ATQA: 0x4400
SAK: 0x00

Memory content:

[00] * 04:65:AF 46 (UID0-UID2, BCC0)
[01] * 12:FF:38:81 (UID3-UID6)
[02] . 54 48 00 00 (BCC1, INT, LOCK0-LOCK1)
[03] . E1:10:6D:0F (OTP0-OTP3)
[04] . 03 1F D1 01 |…|
[05] . 1B 54 82 65 |.T.e|
[06] . 6E FF FE 30 |n…0|
[07] . 00 39 00 30 |.9.0|
[08] . 00 35 00 34 |.5.4|
[09] . 00 36 00 39 |.6.9|
[0A] . 00 35 00 33 |.5.3|
[0B] . 00 33 00 38 |.3.8|
[0C] . 00 FE 00 00 |…|
[0D] . 3D 6B 65 6E |=ken|
[0E] . 67 6F 25 32 |go%2|
[0F] . 30 73 68 69 |0shi|
[10] . 6E 64 61 26 |nda&|
[11] . 69 6E 70 75 |inpu|
[12] . 74 3D 74 65 |t=te|
[13] . 78 74 26 74 |xt&t|
[14] . 65 78 74 3D |ext=|
[15] . 30 39 30 35 |0905|
[16] . 34 36 39 35 |4695|
[17] . 33 33 38 11 |338.|
[18] . 01 1B 54 82 |…T.|
[19] . 65 6E FF FE |en…|
[1A] . 30 00 39 00 |0.9.|
[1B] . 30 00 35 00 |0.5.|
[1C] . 34 00 36 00 |4.6.|
[1D] . 39 00 35 00 |9.5.|
[1E] . 33 00 33 00 |3.3.|
[1F] . 38 00 51 01 |8.Q.|
[20] . 33 55 04 6C |3U.l|
[21] . 61 6B 65 73 |akes|
[22] . 69 64 65 6C |idel|
[23] . 6C 61 6D 61 |lama|
[24] . 2E 63 6F 6D |.com|
[25] . 2F 61 70 70 |/app|
[26] . 3F 68 6B 3D |?hk=|
[27] . 6B 65 6E 67 |keng|
[28] . 6F 25 32 30 |o%20|
[29] . 73 68 69 6E |shin|
[2A] . 64 61 25 32 |da%2|
[2B] . 30 31 39 39 |0199|
[2C] . 35 31 31 30 |5110|
[2D] . 39 FE 00 00 |9…|
[2E] . 00 00 00 00 |…|
[2F] . 00 00 00 00 |…|
[30] . 00 00 00 00 |…|
[31] . 00 00 00 00 |…|
[32] . 00 00 00 00 |…|
[33] . 00 00 00 00 |…|
[34] . 00 00 00 00 |…|
[35] . 00 00 00 00 |…|
[36] . 00 00 00 00 |…|
[37] . 00 00 00 00 |…|
[38] . 00 00 00 00 |…|
[39] . 00 00 00 00 |…|
[3A] . 00 00 00 00 |…|
[3B] . 00 00 00 00 |…|
[3C] . 00 00 00 00 |…|
[3D] . 00 00 00 00 |…|
[3E] . 00 00 00 00 |…|
[3F] . 00 00 00 00 |…|
[40] . 00 00 00 00 |…|
[41] . 00 00 00 00 |…|
[42] . 00 00 00 00 |…|
[43] . 00 00 00 00 |…|
[44] . 00 00 00 00 |…|
[45] . 00 00 00 00 |…|
[46] . 00 00 00 00 |…|
[47] . 00 00 00 00 |…|
[48] . 00 00 00 00 |…|
[49] . 00 00 00 00 |…|
[4A] . 00 00 00 00 |…|
[4B] . 00 00 00 00 |…|
[4C] . 00 00 00 00 |…|
[4D] . 00 00 00 00 |…|
[4E] . 00 00 00 00 |…|
[4F] . 00 00 00 00 |…|
[50] . 00 00 00 00 |…|
[51] . 00 00 00 00 |…|
[52] . 00 00 00 00 |…|
[53] . 00 00 00 00 |…|
[54] . 00 00 00 00 |…|
[55] . 00 00 00 00 |…|
[56] . 00 00 00 00 |…|
[57] . 00 00 00 00 |…|
[58] . 00 00 00 00 |…|
[59] . 00 00 00 00 |…|
[5A] . 00 00 00 00 |…|
[5B] . 00 00 00 00 |…|
[5C] . 00 00 00 00 |…|
[5D] . 00 00 00 00 |…|
[5E] . 00 00 00 00 |…|
[5F] . 00 00 00 00 |…|
[60] . 00 00 00 00 |…|
[61] . 00 00 00 00 |…|
[62] . 00 00 00 00 |…|
[63] . 00 00 00 00 |…|
[64] . 00 00 00 00 |…|
[65] . 00 00 00 00 |…|
[66] . 00 00 00 00 |…|
[67] . 00 00 00 00 |…|
[68] . 00 00 00 00 |…|
[69] . 00 00 00 00 |…|
[6A] . 00 00 00 00 |…|
[6B] . 00 00 00 00 |…|
[6C] . 00 00 00 00 |…|
[6D] . 00 00 00 00 |…|
[6E] . 00 00 00 00 |…|
[6F] . 00 00 00 00 |…|
[70] . 00 00 00 00 |…|
[71] . 00 00 00 00 |…|
[72] . 00 00 00 00 |…|
[73] . 00 00 00 00 |…|
[74] . 00 00 00 00 |…|
[75] . 00 00 00 00 |…|
[76] . 00 00 00 00 |…|
[77] . 00 00 00 00 |…|
[78] . 00 00 00 00 |…|
[79] . 00 00 00 00 |…|
[7A] . 00 00 00 00 |…|
[7B] . 00 00 00 00 |…|
[7C] . 00 00 00 00 |…|
[7D] . 00 00 00 00 |…|
[7E] . 00 00 00 00 |…|
[7F] . 00 00 00 00 |…|
[80] . 00 00 00 00 |…|
[81] . 00 00 00 00 |…|
[82] . 00 00 00 00 |…|
[83] . 00 00 00 00 |…|
[84] . 00 00 00 00 |…|
[85] . 00 00 00 00 |…|
[86] . 00 00 00 00 |…|
[87] . 00 00 00 00 |…|
[88] . 00 00 00 00 |…|
[89] . 00 00 00 00 |…|
[8A] . 00 00 00 00 |…|
[8B] . 00 00 00 00 |…|
[8C] . 00 00 00 00 |…|
[8D] . 00 00 00 00 |…|
[8E] . 00 00 00 00 |…|
[8F] . 00 00 00 00 |…|
[90] . 00 00 00 00 |…|
[91] . 00 00 00 00 |…|
[92] . 00 00 00 00 |…|
[93] . 00 00 00 00 |…|
[94] . 00 00 00 00 |…|
[95] . 00 00 00 00 |…|
[96] . 00 00 00 00 |…|
[97] . 00 00 00 00 |…|
[98] . 00 00 00 00 |…|
[99] . 00 00 00 00 |…|
[9A] . 00 00 00 00 |…|
[9B] . 00 00 00 00 |…|
[9C] . 00 00 00 00 |…|
[9D] . 00 00 00 00 |…|
[9E] . 00 00 00 00 |…|
[9F] . 00 00 00 00 |…|
[A0] . 00 00 00 00 |…|
[A1] . 00 00 00 00 |…|
[A2] . 00 00 00 00 |…|
[A3] . 00 00 00 00 |…|
[A4] . 00 00 00 00 |…|
[A5] . 00 00 00 00 |…|
[A6] . 00 00 00 00 |…|
[A7] . 00 00 00 00 |…|
[A8] . 00 00 00 00 |…|
[A9] . 00 00 00 00 |…|
[AA] . 00 00 00 00 |…|
[AB] . 00 00 00 00 |…|
[AC] . 00 00 00 00 |…|
[AD] . 00 00 00 00 |…|
[AE] . 00 00 00 00 |…|
[AF] . 00 00 00 00 |…|
[B0] . 00 00 00 00 |…|
[B1] . 00 00 00 00 |…|
[B2] . 00 00 00 00 |…|
[B3] . 00 00 00 00 |…|
[B4] . 00 00 00 00 |…|
[B5] . 00 00 00 00 |…|
[B6] . 00 00 00 00 |…|
[B7] . 00 00 00 00 |…|
[B8] . 00 00 00 00 |…|
[B9] . 00 00 00 00 |…|
[BA] . 00 00 00 00 |…|
[BB] . 00 00 00 00 |…|
[BC] . 00 00 00 00 |…|
[BD] . 00 00 00 00 |…|
[BE] . 00 00 00 00 |…|
[BF] . 00 00 00 00 |…|
[C0] . 00 00 00 00 |…|
[C1] . 00 00 00 00 |…|
[C2] . 00 00 00 00 |…|
[C3] . 00 00 00 00 |…|
[C4] . 00 00 00 00 |…|
[C5] . 00 00 00 00 |…|
[C6] . 00 00 00 00 |…|
[C7] . 00 00 00 00 |…|
[C8] . 00 00 00 00 |…|
[C9] . 00 00 00 00 |…|
[CA] . 00 00 00 00 |…|
[CB] . 00 00 00 00 |…|
[CC] . 00 00 00 00 |…|
[CD] . 00 00 00 00 |…|
[CE] . 00 00 00 00 |…|
[CF] . 00 00 00 00 |…|
[D0] . 00 00 00 00 |…|
[D1] . 00 00 00 00 |…|
[D2] . 00 00 00 00 |…|
[D3] . 00 00 00 00 |…|
[D4] . 00 00 00 00 |…|
[D5] . 00 00 00 00 |…|
[D6] . 00 00 00 00 |…|
[D7] . 00 00 00 00 |…|
[D8] . 00 00 00 00 |…|
[D9] . 00 00 00 00 |…|
[DA] . 00 00 00 00 |…|
[DB] . 00 00 00 00 |…|
[DC] . 00 00 00 00 |…|
[DD] . 00 00 00 00 |…|
[DE] . 00 00 00 00 |…|
[DF] . 00 00 00 00 |…|
[E0] . 00 00 00 00 |…|
[E1] . 00 00 00 00 |…|
[E2] . 00 00 00 BD (LOCK2-LOCK4, CHK)
[E3] . 04 00 00 FF (CFG, MIRROR, AUTH0)
[E4] . 00 05 – -- (ACCESS)
[E5] +P FF FF FF FF (PWD0-PWD3)
[E6] +P 00 00 – -- (PACK0-PACK1)

*:locked & blocked, x:locked,
+:blocked, .:un(b)locked, ?:unknown
r:readable (write-protected),
p:password protected, -:write-only
P:password protected write-only


The scan shows no lock bits are set… so this is probably a TLV issue or something like that. Use TagWriter, go to erase tag, choose format option;

After that you should be able to write again.

Thanks!
byte set to 253?

Try hitting “No” first and not specifying the size.

If that doesn’t work, then enter “888” for the number of bytes.

Initialized to the above setting because it can not be done.

Do you know how to set this up? Cannot write.

Initialized to the above setting because it can not be done.

Do you know how to set protection in such a case? Cannot write.

Answer the question.

So you were not able to use “Erase & format as NDEF”? That’s the solution he suggested.

1 Like