Can't write xEM tag any more


#1

I’ve had an xEM tag in my left hand for a couple of years now and I’ve cloned cards to it several times using the cloner I got on the Dangerous Things store. It worked like a dream until the other day when it failed to write. I even got that chinese multi-frequency reader/writer on amazon to see if the cloner was to blame. no dice. The tag is still readable, but it’s like the read-only bit got flipped or something. Any thoughts?


#2

Amal has already removed the cloner from the website ages ago due that problem. if you want get a proxmark3 using the same or similar antennae to the xem access controller and you may be able to unbrick it. if not then you will need to go through some pain to remove and/ or replace the xem.

dont ever use the cheap cloner as they can cause the same problem.


#3

Actually this is not accurate… it is not the cloner that is the issue… the T5577 chip itself is to blame.

First read this;

https://forum.dangerousthings.com/t/quirks-of-the-t5577-cloning-tags-to-the-xem

Then read this;

https://forum.dangerousthings.com/t/xem-cloning-emulation-modes-and-the-perils-of-chinese-cloners

In short @StoicMaverick it may be possible to recover your tag. I will be working with @TomHarkness to eventually create a clear “how to” guide for doing just that, and we are also working on a new proxmark3 antenna that will couple well with the xEM.