uConnect 15.26.1 is buggy; I want to downgrade. - Page 3 - Jeep Garage - Jeep Forum

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  #25  
Old 07-28-2015, 05:00 PM
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Quote:
Originally Posted by f1anatic View Post
I find it safer to hack the installation and delete the Sierra Wireless driver from the ISO. If anything is bad, then install the full, unmolested ISO.
That might be a reasonable stopgap. I thought their checksum validation would prevent it. God knows if I were an FCA engineer I would ensure that randomly corrupted images wouldnt load and I would use cryptographic signatures. Then again, this engineering team left the system exploitable via simple OTA exploit. So, perhaps I shouldn't overestimate their prowess.

I'd prefer to physically disable the antenna, which is innocuous enough (requiring equivalent termination at worst). However, I also I admit I wasn't relishing the prospect of blowing a weekend on finicky trim pieces while disassembling the console, etc.

I've decompressed the iso in the past and poked around. Happen to have a list of driver files I should purge? Other steps required (e.g. forging a new checksum)? Thanks.

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  #26  
Old 07-28-2015, 05:05 PM
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Re: uConnect 15.26.1 is buggy; I want to downgrade.

Quote:
Originally Posted by Jimbo866 View Post
Does anyone know for sure what's the recall update actually consist of ? Is it just the update to the Uconnect ? The 15.26.1. Because I updated my Uconnect to the new version 15.26.1, and I'm having problems with remote lock and unlock plus the assist icons in the screen don't work. It says your vehicle is not registered with Uconnect. It is registered with Uconnect. I took it to the dealer and they said there is nothing wrong with the radio. It's Uconnect sending some update to my Jeep and I have to wait 5 days for it to go through. I think it BS but I have no choice. But they said they did the recall update also. I said that I thought I already did the update to 15.26.1. He said that there was another update they applied for the recall. Is it all Bull Shit? I don't know if I believe them.


Sent from my iPad using JeepGarage

This sounds fishy to me. I would call uconnect/Chrysler support ASAP and ask them for help with your issue.


Sent from my iPhone using JeepGarage
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  #27  
Old 07-28-2015, 07:57 PM
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Re: uConnect 15.26.1 is buggy; I want to downgrade.

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Originally Posted by Rocketrancher View Post
BTW, I have a post pending review by moderator (new kid on the block?) that touches on the CDMA disconnect scheme....hopefully it'll be cleared soon.
Well, darn.
I was hoping the info would be out by now because there were descriptions and pictures, but maybe it's such a big place that it'll take awhile.

Lemme try a summary, since the antenna topic is alive:

On the back of the Uconnect head unit are 4 antenna receptacles. The red one serves the CDMA radio. Disconnecting it will deny access to the carrier and air-gap the vehicle network.

It will not affect the entertainment radios nor services provided by SXM.

Loss of antenna will, however, be detected by the radio and a "vehicle phone trouble" nag screen appears each time Uconnect initializes. The "no service" indicator on the mirror will also be lit. The nag screen can be dispatched or allowed to time-out, but it's still a nuisance.

Perhaps properly terminating the connection will appease the radio, so the experiment will continue when I get some connectors to work with.
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  #28  
Old 07-28-2015, 09:26 PM
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Re: uConnect 15.26.1 is buggy; I want to downgrade.

Can someone test and see if the viaMobile voice commands still work on their radios? (ex, "Pandora via Mobile" or "iHeartRadio via Mobile") The system no longer recognizes those commands for me
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  #29  
Old 07-29-2015, 06:02 AM
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Quote:
Originally Posted by Rocketrancher View Post
Perhaps properly terminating the connection will appease the radio
I can't imagine an alternative scenario where proper termination does *not* work. For anyone who has Sprint as a carrier, it's quite apparent there are many dead spots/regions in the country. If the system were to complain about zero signal we would have heard about it by now from owners who live in areas without Sprint coverage.

Thanks for posting. I'll be closely following your progress. BTW, how involved is it to access the antenna connection?
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  #30  
Old 07-29-2015, 10:47 AM
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Re: uConnect 15.26.1 is buggy; I want to downgrade.

Quote:
Originally Posted by Roadkill View Post

Thanks for posting. I'll be closely following your progress. BTW, how involved is it to access the antenna connection?
Thanks for the heads-up, RK. I see the post now, and hope the pics will help.

Accessing this radio is probably easiest of any car I've owned.
The emotional part is removing the trim/bezel, but once you get used to the noise it's not so bad:

Open the lower compartment so you can grip the lower part of the bezel with your fingertips, brace with your thumbs, and pull outward. Clips will release allowing you to work your fingers around the opening until it is free, then ease the grill areas from the ducts a few inches to let you lift the bezel away from the dash enough to release the harness connector behind the control panel. Before you set the bezel aside, check all the clips to ensure that the orange pieces are still there and intact, and that the grill assemblies haven't come unsnapped from the panel. The radio is held by 4 sheet metal screws, and a 7mm socket will deal with them. Installation is the ever popular "reverse of removal".

There are illustrations and instructions in the body manual that can be found at WK2jeeps (Jeep Grand Cherokee WK2 - Interior trim removal). Officially, they advise to use trimsticks to pry with. For the first time, extra leverage might be good but I found that the edge of the dash is softer on my '14 than it was on the '11, and the sticks are less effective than my thumbs.
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  #31  
Old 07-29-2015, 12:46 PM
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Re: uConnect 15.26.1 is buggy; I want to downgrade.

Quote:
Originally Posted by Roadkill View Post
That might be a reasonable stopgap. I thought their checksum validation would prevent it. God knows if I were an FCA engineer I would ensure that randomly corrupted images wouldnt load and I would use cryptographic signatures. Then again, this engineering team left the system exploitable via simple OTA exploit. So, perhaps I shouldn't overestimate their prowess.
There is a checksum, however Customtronix at least has figured out a way around it, involving multiple ISOs.

I agree that a software solution is the best way to tackle this.
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  #32  
Old 07-29-2015, 04:05 PM
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Re: uConnect 15.26.1 is buggy; I want to downgrade.

Quote:
Originally Posted by Roadkill View Post
That might be a reasonable stopgap. I thought their checksum validation would prevent it. God knows if I were an FCA engineer I would ensure that randomly corrupted images wouldnt load and I would use cryptographic signatures. Then again, this engineering team left the system exploitable via simple OTA exploit. So, perhaps I shouldn't overestimate their prowess.

I'd prefer to physically disable the antenna, which is innocuous enough (requiring equivalent termination at worst). However, I also I admit I wasn't relishing the prospect of blowing a weekend on finicky trim pieces while disassembling the console, etc.

I've decompressed the iso in the past and poked around. Happen to have a list of driver files I should purge? Other steps required (e.g. forging a new checksum)? Thanks.
Caution, haven't poked around 100% but the SIERRA_WIRELESS would be a place to start--assuming it doesn't brick your system. The manifest files would likely need editing.

Once you remove the antenna or the wireless card driver, you wouldn't be able to 911 from the button on the mirror or call uconnect.
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  #33  
Old 07-29-2015, 04:06 PM
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Re: uConnect 15.26.1 is buggy; I want to downgrade.

Quote:
Originally Posted by Roadkill View Post
Heh. Well, at least we have a known good firmware revision (i.e. the previous release).

I may downgrade regardless, but I'm definitely out for blood when it comes to this datalink antenna. It needs to die. I'm not against applying wire cutters for a permanent "fix", if that's what it takes to render it inoperable.

Just need to figure out what's involved getting back there and what to disconnect/sever.
Let me know if you find the previous version (15.6) I been looking for it too for my MY15 RA3
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  #34  
Old 07-29-2015, 05:09 PM
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Quote:
Originally Posted by lstowell View Post
The manifest files would likely need editing.
Is it clear what's checksummed? I notice when I'm flashing it briefly checks "something". This mod is beginning to sound easier than the process I go through to hack/modify an Android apk or a Mac OS signed system binary. Those require cryptographic keys, nested signatures/checksums on manifests, or more.

I'd love it if I had the time to customize my uConnect firmware like I do with my Android ROMs.

Quote:
Once you remove the antenna or the wireless card driver, you wouldn't be able to 911 from the button on the mirror or call uconnect.
Yep, that's absolutely correct.

Quote:
Originally Posted by Ltnluv23 View Post
Let me know if you find the previous version (15.6) I been looking for it too for my MY15 RA3
I've gotten into the habit of saving the isos. I have a 2014, though. Different firmware iso vs the 2015's.

A paid member might be able to chime in to let you know if they still have access to the previous versions through the jeepgarage VIP forum.
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  #35  
Old 07-29-2015, 09:28 PM
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Re: uConnect 15.26.1 is buggy; I want to downgrade.

Here's the HK (MY14) wiring diagram in case it fills in a blank.

http://www.wk2jeeps.com/audio/2014_w...io_diagram.pdf
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  #36  
Old 08-02-2015, 09:02 AM
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Re: uConnect 15.26.1 is buggy; I want to downgrade.

Quote:
Originally Posted by Rocketrancher View Post
Greetings

I've been lurking around for a long time but never really had something I thought significant to share until now. I think I can help…

I never activated even the trial "Access" because, after reading the privacy policy, i disagreed with feeding operational data from my vehicle to who-knows-where-and-why. The proof-of-concept exploit didn't really scare me but after reading quotes from FCA claiming they know everything about how all their products are being used, it's pretty clear that they don't need anyone to agree with their policies to siphon data so it's time to AirGap the Rat.

Yes, the CDMA radio has a unique antenna. And it can be disconnected without compromising the satellite and terrestrial entertainment radios. That's good news.

Satellite-delivered services, like TravelLink, are not affected if the CDMA radio is disconnected. More good news.

Not-so-good news: That radio knows when it doesn't have an antenna and posts a nag screen to have the "vehicle phone serviced". Although the screen can be dismissed or will time-out after a few seconds, it's still a nuisance and will occur each time Uconnect initializes. The "no service" indicator on the rearview mirror is also lit.

Next step is to see if there's DC power on that port to help to decide if I can terminate the antenna port with a dummy load to appease the radio, so I'll be shopping for connectors for a little while - maybe a trip to the junkyard - and hope to offer some more findings before too long.

I'm also curious about just where this antenna is…..sharkfin? dashboard? Perhaps minor details, but if it's in the dash it might also be tamed with a shield……tinfoil hat, anyone?

Anyway, I hope this helps.
In the meantime, here's what I know, for others who also might want to pursue the air gap:

(Connections in the back of the Uconnect head)

White - am/fm terrestrial radio
Green - for sat + nav radio
Pink - for sat radio only
Red - CDMA radio

There is another White connector body, larger and away from the antenna cables, that connects to the USB hub.

(some pics)

The cables…


CDMA connected… (sorry 'bout the glare)


CDMA disconnected, TravelLink lives!


Nag screen…


No service…
Excellent post! Thank you.
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