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#1 2018-12-04 21:46:10

Gtpy
Contributor
From: GER
Registered: 2017-10-24
Posts: 32

[solved] [RDV4] lf info question

Hi,

maybe the wrong approach of mine:

But I'm trying to identify the lf card that was on the RDV4.

pm3 --> lf search
NOTE: some demods output possible binary
  if it finds something that looks like a tag          
False Positives ARE possible
          

Checking for known tags:
          
          
[+] Valid Indala ID Found!
          

Valid T55xx Chip Found
Try `lf t55xx` commands

Now i try lf t55xx:

pm3 --> lf t55xx info
pm3 -->

Nothing happens.

If I try first: lf t55xx detect:

pm3 --> lf t55xx detect
Chip Type  : T55x7          
Modulation : ASK          
Bit Rate   : 2 - RF/32          
Inverted   : No          
Offset     : 31          
Seq. Term. : Yes          
Block0     : 0x000880E8

And then lf t55xx info it works.
Is this a normal behavior?

Thanks a lot.

Last edited by Gtpy (2018-12-09 22:58:46)

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#2 2018-12-04 21:59:06

iceman
Administrator
Registered: 2013-04-25
Posts: 9,468
Website

Re: [solved] [RDV4] lf info question

nay..  that is just bad behavior..   Put the tag direct on antenna.   The modulation is most likely ASK

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#3 2018-12-04 22:19:21

Gtpy
Contributor
From: GER
Registered: 2017-10-24
Posts: 32

Re: [solved] [RDV4] lf info question

iceman wrote:

nay..  that is just bad behavior..   Put the tag direct on antenna.   The modulation is most likely ASK

I put it direct on antenna. I had even removed the case.
But same behavior.

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#4 2018-12-05 07:11:50

Gtpy
Contributor
From: GER
Registered: 2017-10-24
Posts: 32

Re: [solved] [RDV4] lf info question

Gtpy wrote:
iceman wrote:

nay..  that is just bad behavior..   Put the tag direct on antenna.   The modulation is most likely ASK

I put it direct on antenna. I had even removed the case.
But same behavior.

@iceman this couldn’t be a hardware problem,right?
The LF is working correct I think.
Are there ways to test this? hw tune looks ok.
(It’s because I'm not so familiar with it yet.)
Thanks.

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#5 2018-12-05 11:20:36

iceman
Administrator
Registered: 2013-04-25
Posts: 9,468
Website

Re: [solved] [RDV4] lf info question

Easy way to detect HW vs FW...  Swap client/firmware to offical repo.    If it works there,  its FW  smile

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#6 2018-12-05 16:50:45

Gtpy
Contributor
From: GER
Registered: 2017-10-24
Posts: 32

Re: [solved] [RDV4] lf info question

Ok I tested it with offical repo:

I have also ordered some other LF cards, maybe it is something wrong by the delivered card.

hw tune

Measuring antenna characteristics, please wait..........          
# LF antenna: 69,44 V @   125.00 kHz          
# LF antenna: 38,22 V @   134.00 kHz          
# LF optimal: 69,44 V @   125,00 kHz          
# HF antenna: 46,34 V @    13.56 MHz          
Displaying LF tuning graph. Divisor 89 is 134khz, 95 is 125khz.
lf search
NOTE: some demods output possible binary
  if it finds something that looks like a tag          
False Positives ARE possible
          

Checking for known tags:
          

No Known Tags Found!
lf search u
NOTE: some demods output possible binary
  if it finds something that looks like a tag          
False Positives ARE possible
          

Checking for known tags:
          

No Known Tags Found!
          

Checking for Unknown tags:
          
Possible Auto Correlation of 32 repeating samples          

Using Clock:32, Invert:0, Bits Found:513          
ASK/Manchester - Clock: 32 - Decoded bitstream:          
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
1111111111111111
          

Unknown ASK Modulated and Manchester encoded Tag Found!          

if it does not look right it could instead be ASK/Biphase - try 'data rawdemod ab'          

Valid T55xx Chip Found
Try lf t55xx ... commands

lf t55xx info doesn't give anything back

proxmark3> lf t55xx info
proxmark3>

only if I run first lf t55xx detect

proxmark3> lf t55xx detect
Chip Type  : T55x7          
Modulation : ASK          
Bit Rate   : 2 - RF/32          
Inverted   : No          
Offset     : 31          
Seq. Term. : No          
Block0     : 0x00088040

then run lf t55xx info

lf t55xx info
          
-- T55x7 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                 : 2          
 Password mode             : No          
 Sequence Start Terminator : No          
 Fast Write                : No          
 Inverse data              : No          
 POR-Delay                 : No          
-------------------------------------------------------------          
 Raw Data - Page 0          
     Block 0  : 0x00088040  00000000000010001000000001000000          
-------------------------------------------------------------

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#7 2018-12-05 16:55:03

iceman
Administrator
Registered: 2013-04-25
Posts: 9,468
Website

Re: [solved] [RDV4] lf info question

We can rule out that your device is not defect.    You can use the card with   lf hid clone   or  lf em...

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#8 2018-12-05 17:15:55

Gtpy
Contributor
From: GER
Registered: 2017-10-24
Posts: 32

Re: [solved] [RDV4] lf info question

Sorry my English is sometimes broken smile

So the device's okay, you mean.
what exactly do you mean:  You can use the card with   lf hid clone   or  lf em... ?
Thanks

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#9 2018-12-05 17:20:45

iceman
Administrator
Registered: 2013-04-25
Posts: 9,468
Website

Re: [solved] [RDV4] lf info question

you wonder about your lf t5577 card was working.   I say it works.  You can try cloning a ID onto it.

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#10 2018-12-05 17:35:26

Gtpy
Contributor
From: GER
Registered: 2017-10-24
Posts: 32

Re: [solved] [RDV4] lf info question

Ah ok. Writing an ID works.
What I meant was that I can rule out a HW defect.
In any case, I still have a lot to learn about the PM. smile

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#11 2018-12-08 17:34:57

grauerfuchs
Contributor
Registered: 2018-08-28
Posts: 50

Re: [solved] [RDV4] lf info question

This does not look like a hardware defect. The T55xx card often cannot be completely read without an 'lf t55 detect' first because the card can send data in many formats. All of the T55 cards I have used function this way on multiple Proxmark devices.

The data read back looks very much like a blank card that has never been programmed or one that has been wiped. Iceman is correct. If you can write to it and you get that written data back when you read the card next, it is not a hardware defect.

Last edited by grauerfuchs (2018-12-08 17:37:43)

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#12 2018-12-09 22:58:20

Gtpy
Contributor
From: GER
Registered: 2017-10-24
Posts: 32

Re: [solved] [RDV4] lf info question

thanks a lot this will help.
I will learn a lot from the community and try to contribute as much as possible.

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