Hello ProxmarkWaiders )) some time ago, buy smart ring (Jakcom R5) & some tools (ChameleonUltra) all worked perfectly until my crooked hands forced to write 2 bytes in 0 block and part of the ring stopped to be defined.
I was looking for all sorts of solutions on the Internet, and here I am:
And with me: win10x64 & Proxmark3 & ProxSpace.
Help me to return the ring to service ))
The Chinese borderline illegal “magic” chips have no official SKU or model number or any way to refer to the plethora of different magic chips with any reliable name. The R5 manual refers to the mifare 1k magic chip only as “IC Module Chip: CUID” (changeable UID) .. do you know if it’s a gen1a or gen2 chip? I doubt it’s gen3 or gen4. What commands did you use with the proxmark3 to change the UID on these chips in the ring?
I noticed a hint of sarcasm ) Apparently, it’s not all lost yet.
I damaged the ring using Chamelion Ultra,
(Sorry: I have no idea where the information from the past came from.)
I was writing a letter to my favorite aunt., I changed the values in the 0 block of the dump and set the “WARNING”write block '0' to true.
Now I’m here. I decided to seek help from the first authority in the restoration process. The ring has stopped being recognized as functional.
ISO14443-A tag
I don’t know much about that process. What needs to be sorted out is what kind of magic chip it is. Is it gen1a or gen2? The reason I’m asking is that the recovery process you could try depends on which type it is.
“Please understand me correctly: everything I used to damage the tag no longer recognizes it and, therefore, cannot interact with it. That is why I switched to using Proxmark3, which at least is capable of detecting the presence of the tag. Could you advise which set of commands I should use in the Proxmark3 console to make our discussion more informative?”
I know. I was maybe unclear. You should contact jacom support and ask them specifically if the chip is a gen1a or gen2. They might not know. In that case you will have to buy another ring just for testing if you want to have a starting place where you may be able to fix your first one.
No, that didn’t work. MCT does not detect the tag.
The card/ring has 4 zones.
Zone 1, which I rewrote, has stopped responding — BCC error.
However, there are still 3 other zones, from which I can easily provide data.
It is also known that Zone 1 and Zone 3 are parts of a single logical block and use a 4-byte BCC, while Zones 2 and 4 use a 7-byte BCC, and I suspect they are sequential.
Zone 2: 04:DD:2D:AA:5C:17:90
Zone 4: 04:51:4A:AA:5C:17:91
Zone 3: 6A:B7:E8:69
“That’s fine. The request is already on its way to Jakcom. In any case, they have already offered me a new ring with only shipping costs to be paid — I should take it without unnecessary discussion and wait for the information.
Thanks.
Ready. Support said: The device in your hand cannot change the incorrect data.
The IC module of the ring in your hand is a second-generation CUID chip.
Ok so they think it’s a gen2 (maybe).. in this case a proxmark3 might be possible to fix it but generally speaking a gen2 chip is very sensitive to misconfiguration and might be bricked at this point. The gen1a chips have a backdoor command you can use to get around all security and configuration settings to force write changes to fix things but a gen2 chip does not have this feature.
Anyone have any ideas to try on a gen2 chip with messed up sector 0
sorry…