Proxmark developers community

Research, development and trades concerning the powerful Proxmark3 device.

Remember; sharing is caring. Bring something back to the community.


"Learn the tools of the trade the hard way." +Fravia

You are not logged in.

#1 2018-02-13 16:43:40

tristanik
Contributor
From: Italy
Registered: 2014-11-25
Posts: 66

lf t55 write

My friends
I'm trying to write a t55 tag without a password on page 1 block 2, but I can not do the writing. Do you have an idea of the possible solution?

Prox/RFID mark3 RFID instrument         
bootrom: master/v3.0.1-301-gc839fa2-suspect 2018-02-01 14:56:56
os: master/v3.0.1-301-gc839fa2-suspect 2018-02-01 14:57:00
LF FPGA image built for 2s30vq100 on 2015/03/06 at 07:38:04
HF FPGA image built for 2s30vq100 on 2017/10/27 at 08:30:59
uC: AT91SAM7S256 Rev B         
Embedded Processor: ARM7TDMI         
Nonvolatile Program Memory Size: 256K bytes. Used: 199376 bytes (76%). Free: 62768 bytes (24%).         
Second Nonvolatile Program Memory Size: None         
Internal SRAM Size: 64K bytes         
Architecture Identifier: AT91SAM7Sxx Series         
Nonvolatile Program Memory Type: Embedded Flash Memory

proxmark3> lf t55 detect
Modulation : ASK         
Bit Rate   : 2 - RF/32         
Inverted   : No         
Offset     : 31         
Block0     : 0x00088080

proxmark3> lf t55 info
-- T55xx Configuration & Tag Information --------------------         
-------------------------------------------------------------         
Safer key                 : 0         
reserved                  : 0         
Data bit rate             : 2 - RF/32         
eXtended mode             : No         
Modulation                : 8 - Manchester         
PSK clock frequency       : 0         
AOR - Answer on Request   : No         
OTP - One Time Pad        : No         
Max block                 : 4         
Password mode             : No         
Sequence Start Terminator : No         
Fast Write                : No         
Inverse data              : No         
POR-Delay                 : No         
-------------------------------------------------------------         
Raw Data - Page 0         
     Block 0  : 0x00088080  00000000000010001000000010000000         
------------------------------------------------------------- 
proxmark3> lf t55 dump
Reading Page 0:         
blk | hex data | binary         
  0 | 00088080 | 00000000000010001000000010000000         
  1 | E695AAA1 | 11100110100101011010101010100001         
  2 | 48911136 | 01001000100100010001000100110110         
  3 | 11111111 | 00010001000100010001000100010001         
  4 | 11111189 | 00010001000100010001000110001001         
  5 | FFFFFFFF | 11111111111111111111111111111111         
  6 | FFFFFFFF | 11111111111111111111111111111111         
  7 | FFFFFFFF | 11111111111111111111111111111111         
Reading Page 1:         
blk | hex data | binary         
  0 | 00088080 | 00000000000010001000000010000000         
  1 | E0150A70 | 11100000000101010000101001110000         
  2 | 3CB317B1 | 00111100101100110001011110110001         
  3 | FFFFFFFF | 11111111111111111111111111111111


proxmark3> lf t55 wr b 2 d 79662F62 1
Writing to page: 1  block: 2  data : 0x79662F62

proxmark3> lf t55 dump
Reading Page 0:         
blk | hex data | binary         
  0 | 00088080 | 00000000000010001000000010000000         
  1 | E695AAA1 | 11100110100101011010101010100001         
  2 | 48911136 | 01001000100100010001000100110110         
  3 | 11111111 | 00010001000100010001000100010001         
  4 | 11111189 | 00010001000100010001000110001001         
  5 | FFFFFFFF | 11111111111111111111111111111111         
  6 | FFFFFFFF | 11111111111111111111111111111111         
  7 | FFFFFFFF | 11111111111111111111111111111111         
Reading Page 1:         
blk | hex data | binary         
  0 | 00088080 | 00000000000010001000000010000000         
  1 | E0150A70 | 11100000000101010000101001110000         
  2 | 3CB317B1 | 00111100101100110001011110110001         
  3 | FFFFFFFF | 11111111111111111111111111111111

after the dump it is seen that the writing was not carried out....

Offline

#2 2018-02-13 17:26:46

marshmellow
Moderator
From: US
Registered: 2013-06-10
Posts: 2,196

Re: lf t55 write

Block 2 of page 1 is normally a locked block from the factory. (As is block 1 of page 1)

Offline

#3 2018-02-13 19:23:54

tristanik
Contributor
From: Italy
Registered: 2014-11-25
Posts: 66

Re: lf t55 write

Why this Block change after use?

Offline

#4 2018-02-13 19:47:28

marshmellow
Moderator
From: US
Registered: 2013-06-10
Posts: 2,196

Re: lf t55 write

It cannot be changed under normal conditions.

Offline

Board footer

Powered by FluxBB