Cloning Gproxii Guardall Card

Hey , I have been using my proxmark 3 since august and have been having great success cloning key fobs / cards as a side hustle, however I’ve been stuck on one persons key card. Its a guardall gproxii card and I have used the recommended commands in pm3 to clone this card to my t55xx fobs . After I clone it shows done and verified when I search for the card after it comes up as Valid Guardall G-Prox II ID with correct fmt / fc / cn but the raw number is different even after attempting it a few times the raw number isnt identical. I gave him the clones anyway to see if they’d work and he said they dont. Any help regarding this would be great , ill post the commands im using below.

lf search

G-Prox-II - len: 36 FC: 20 Card: 716988, Raw: fbc836a56f13c86021c163da

lf gproxii clone --fmt 36 --fc 20 --cn 716988

Data written and verified

lf gproxii reader

G-Prox-II - len: 36 FC: 20 Card: 716988, Raw: f98c67b8c6318cf10588718e

dm me i’ll fix it for ya

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ok check your discord

Hi there I’m running into the same issue what was the fix for this?

are you the guy i helped o discord

Hey all, having the same issue. Is there something general I can try to resolve? Would be good to get some troubleshooting steps on the thread here so we don’t have to bother Equipter each time :joy:

add me on discord: equip

(i should really just formalise this into a tut lmao)

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I have had success cloning gprox cards as a t55xx, as that dumps everything and then writing them onto a new tag.

lf gproxii read
[+] G-Prox-II - Len: 26 FC: xxx Card: x3 xor: xx, Raw: f8...

[usb] pm3 --> lf t55xx detect
[=]  Chip type......... T55x7
[=]  Modulation........ BIPHASE
[=]  Bit rate.......... 5 - RF/64
[=]  Inverted.......... No
[=]  Offset............ 32
[=]  Seq. terminator... No
[=]  Block0............ F0150060 (auto detect)
[=]  Downlink mode..... default/fixed bit length
[=]  Password set...... No

[usb] pm3 --> lf t55xx dump

[+] Page 0
[+] blk | hex data | binary                           | ascii
[+] ----+----------+----------------------------------+-------
[+]  00 | F0150060 | 11110000000101010000000001100000 | ...`
...
[+]  07 | 00000000 | 00000000000000000000000000000000 | ....

[+] Page 1
[+] blk | hex data | binary                           | ascii
[+] ----+----------+----------------------------------+-------
[+]  00 | F0150060 | 11110000000101010000000001100000 | ...`
..
[+]  03 | 00000000 | 00000000000000000000000000000000 | ....
[+] saved 48 bytes to binary file /pm3/lf-t55xx-...-dump.bin
[+] saved to json file /pm3/lf-t55xx-...-dump.json

Swap to blank tag

[usb] pm3 --> lf t55xx restore --file lf-t55xx-gprox-dump.json
lf gproxii read
[+] G-Prox-II - Len: 26 FC: xxx Card: x3 xor: xx, Raw: f8...

And that has consistently worked for me.

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