Okay, I found it, Follow the link to get the whole situation, But in short
Keep in mind that this antenna is not designed to work with the proxmark3 , nor has it been tuned even closely to what it should be. So, when issuing a hw tune you’ll be under 10v with a long cable.
I then Wrote my xEM to an EM410x ID with that same coil to use with some equipment at home for testing, all went well… Until I had to re-write my HID ID back later that night so that I could get in to work the next day. I tried to write, nothing, nothing again, more nothing, Its still in freaking EM410x mode! Argh! WTF!
I shortened the cable between the coil and proxmark and used a lighter gauge wire in an attempt to get more power. This worked, and I was finally able to write the xEM back to HID mode. PHEW! Coil tuning matters more than anything else!
So here goes!
Below I am going to try and outline my experiences with the xEM implant and Chinese cloners in the hopes that it will help some of the community. I am no expert - just a guy that likes to fiddle in my spare time. I got my xEM implanted some months ago and after cloning my work HID card to the xEM with one of the dreaded Blue Cloners I have been on a war path even since to understand the technology properly, unlock my implant and possibly help some other people unlock their implant…
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) took an xAC antenna and connected it to a Proxmark Easy, not the same, but you will see he talks about the tuning. Your case will be slightly different because you are extending for what it is tuned for… blah blah blah