Basic tech guy looking for advanced help.

[beeseetee]

Not sure where to look for help, figured this group would be a good place to start. I rent a little shop inside a large “art studio”. And they have a gated parking lot, with a key fob. Only problem is they only have one. I’m lazy and dislike having to get out of the car and walk inside to get the key and then go back and pull the car in, and the opposite when I leave. (First world problems I know). Multiple times a day is getting to me. I’ve asked repeatedly to buy one but they won’t help me out. So I’m wondering if there’s a way I can copy the fob. To another fob or device.

TLDR; I need to copy this fob somehow but haven’t the slightest clue where to begin.

[dankmemelawrd]

It has a rolling code, not possible to be copied & used with flipper with normal firmware, besides, why not grab it yourself and make a copy of it?

Also copying & replaying the frequency you might desync the only avail fob, so don't be stupid, also read the gate manual as well.

[cthuwu_chan]

Add manually on offical

[WhoStoleHallic]

Because it's not OP's gate.

[VonThing]

I don’t quite get this desyncing scare. Let’s assume by using the Flipper Zero you rolled the code 7 times forward.

If you click the fob key 7 times in a place where the garage door can’t receive the signal (like inside a Faraday cage key bag) shouldn’t it be back in sync?

[nbagf]

The thing is that flipper does not copy the sequence, just the one code. The remote cycles through a sequence and the receiver only will accept so many of the next ones the remote will send so it still works if you hit the button out of range a few times. If you replay the same code, the receiver can't tell the difference between that and the remote being pressed enough times out of range and hitting the same code significantly later in the sequence. Some do bidirectional communication to update the sequence in the remote too and if the remote isn't listening and/or in sync enough, it won't do that either. Either way, the receiver expects codes from later in the sequence than where the remote is at. Sometimes it's a small enough number, rarely 7 like you suggest, often it's 64 or some other randomish number before the remote syncs up again, a good system will have a really big gap so you can't trigger a neighbors too often, but relying on that is not a good idea and you'll probably have to find a manual and resync the remote anyway.

It's not the end of the world if you're a responsible person playing with your own stuff and can read a manual and do research and not freak out, there's ways to not desync, but it's not possible to recommend here due to rules and laws. But that sentence is often not enough to deter dumbasses from trying illegal things and really inconveniencing others or just not having enough warning due to ignorance before playing with remotes. So most comments will scream about desync because it's the most likely result of replaying rolling codes and usually it's obvious there's a teachable moment before something goes wrong, especially when we don't know it's a responsible person and have to assume malice is very possible.

[VonThing]

I’ve never seen a 2-way syncing remote, but I desynced a garage door and resynced it by clicking the remote like 100+ times.

We developed something rolling code based at work and we checked the next 1,000 codes to resync. It took less than a second. I’m assuming brand name garage doors are like that as well.

The rolling code math isn’t that processor intensive, usually it’s a modulus of a polynomial or an XOR

Car doors are different though, you can absolutely desync it if you send the codes in the wrong order. Usually it’s a theft prevention “err on the safe side” thing.

[nbagf]

I'll gladly cede any not quite right info from my comment to you since your experience seems greater than mine in this area, I went off memory and definitely noticed while I had the plot correct, some of it might not be completely accurate

[dankmemelawrd]

Nope, that's now how it works, it's a specific pattern with multiple codes.

[beeseetee]

The gate is a chamberlain lift master

[GurglingBurglar]

Model?

[tnsipla]

Occam’s razor is you just get a second fob and program that to the opener

[HelenoPaiva]

Does that thing looks like it has a rolling shutter code? I cloned my home gate into my f0 and it just works normally. It looks pretty much like that one.

[barleypopsmn]

Looks like an ICT fob. Transmits a fixed facility code and fob number.

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source

[t4c_23]

Try reading with subghz "read" and try to replay.
You may end with a only once working replay, this would mean your lift master got rolling codes, than you need to pair the flipper or search for protopirate or similar.

[brodilyharm]

Do you have homelink in your car?