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#1 2018-09-22 18:43:11

Violet
Contributor
Registered: 2018-09-13
Posts: 11

Q. about writing to T55xx

I apologize if this has been explained in docs and I've missed it.

When you are writing to a T55xx tag, eg. to clone it to em410x format or HID format or FDX-B format, do you need to have the T55xx config info matching the tag's current state first?

Put it another way, let's say I have a t55xx that's currently in EM410x format and I want to switch it to an FDX-B compatible tag, can you just do the "lf fdx clone" command straight away?

Or do you have to do "lf t55xx detect" first so that the Proxmark3 has the right 'config' settings to talk with the t55xx?

Thanks!

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#2 2018-10-03 05:22:36

Tom5ive
Contributor
Registered: 2017-09-18
Posts: 53

Re: Q. about writing to T55xx

You don't technically need to have the config detected, you can also set it manually. Or just leave it default and writes will sometimes work OK, BUT, this is when bitflipping and other issues are more likely to arise as the pm3 may be using different modulation settings from the t55 chip. Reading up on the t5577 chip specifications and modulation standards for EM and HID might be of some use to help you understand this better.

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#3 2018-10-03 13:39:50

Violet
Contributor
Registered: 2018-09-13
Posts: 11

Re: Q. about writing to T55xx

Thanks Tom,

This was in regards to a T5577 who's config block is unknown / scrambled, so I was wondering if one reason I can't 'talk' to it was cos I don't have the PM3 set to the right config settings.

Cheers!

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#4 2018-10-03 14:10:26

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: Q. about writing to T55xx

The t55xx config and detect have nothing to do with writing t55xx chips only block reading them.

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#5 2018-10-03 15:58:18

Violet
Contributor
Registered: 2018-09-13
Posts: 11

Re: Q. about writing to T55xx

Thanks for clearing that up marshmellow!

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