I can't add any tags to the xEM access controller

[pontiaj2066]

I’ve already switched the jumpers to add the 2 master tags, then switched it back to the normal operation mode. I scan the add tag, then any other tag such as my NExT implant, but another beep never sounds. I figured it might’ve just not beeped when adding, so I scanned the add tag again. Afterwards, my NExT never activates it. When scanning to add, the NExT makes the green light blink very fast. My work badge I cloned to the NExT makes the green light solid. The T5577 card that came with my Proxmark 3 makes it solid. Am I doing something wrong?

[Pilgrimsmaster]

What mode is your NExT in?

EM41xx

or prox, indala etc?

[pontiaj2066]

Hid prox. I’m guessing that’s the issue? If so, is there a way to get it to function as hid prox while in the proper mode for the xAC?

[Pilgrimsmaster]

@pontiaj2066

Hid prox

@pontiaj2066

is there a way to get it to function as hid prox while in the proper mode for the xAC?

Nope, Sorry bud

The T5577 chip IS awesome, it just can’t operate on 2 different modes at the same time

At least it is easily solved, you just have a few decisions to make.

• Use your NExT in EM401X mode for your xAC
• Leave it in HID Prox for work
• Or grab a new xEM , FlexEM or another NExT Implant

I know what I would do NExT, but what will you do NExT ?

[enginerd]

Alternatively, you could get an access control system that is compatible with HID Prox or the high frequency side of the NExT.

But chances are that getting a second implant is cheaper and easier and it would also give you more flexibility.

[Eriequiet]

@anon3825968
Was your handy double tag hack cross mode compatible?

[Pilgrimsmaster]

@Eriequiet

Was your handy double tag hack cross mode compatible?

I’ll answer that one for him
No*, you can only do multiple tags of the same type

Hack: store 2 to 3 different EM41xx on a single T5577

I didn’t think this would work, but amazingly it does: you can have more than one EM UID on a single implant. And it works pretty good too! So, a bit of background: as you may know, my SiRFIDaL RFID login software for Linux can work with two different kinds of readers: repeating (or continuous) readers and one-shot readers. The former send whatever is in the field repeatedly (or can be polled continuously), while the latter only send the UIDs of tags that come into the field once. Repeating re…

[Pilgrimsmaster]

@Pilgrimsmaster

No, you can only do multiple tags of the same type

* Here is the proper and full explanation from Rosco ( extracted from the link I provided )

@Eriequiet

Do you think it would be possible to have uid 1 be EM, and uid 2 be hid?

Hack: store 2 to 3 different EM41xx on a single T5577

Well Pilgrim, looks like you’re not the only one interested in this There are two issues with mixing different formats: 1/ If the T5577 frontend and encoding settings are strictly identical between tag type A and tag type B (i.e. if only the format of the bit sequence changes) AND both sequences fit in the T5577’s memory, then yes, you can encode both on the T5577 2/ BUT! The big issue is: will the reader for which the second sequence is intended be forgiving enough to ignore …

[Eriequiet]

I remembered asking, but forgot the answer ,
Worth a shot

Even if it was a possible solution, it’s an advanced one… I haven’t even begun to try monkeying with it

It will be useful once I try to convert my car,

Will let me store my gunsafe and a vehicle em UID on the same chip, without making a spare fob for the car for non cyborgs- also be a key to my safe, I don’t want to have any extra keys floating around, kinda defeats my purpose

[Pilgrimsmaster]

@Eriequiet

Even if it was a possible solution, it’s an advanced one…

Hence my initial “No”
But I thought I should expand for clarification and justification.

Roscos hack is a good one to bookmark

I actually thought he had a good chance for the best post 2021 with that hack

[yeka]

@Pilgrimsmaster

I actually thought he had a good chance for the best post 2021 with that hack

So did I but then someone made “login with google”…

[Eriequiet]

@Pilgrimsmaster

I actually thought he had a good chance for the best post 2021 with that hack

I would have voted for that also, but somehow it got boiled down to a limited selection of posts I didn’t want to vote for